diff --git a/src/wp-includes/blocks.php b/src/wp-includes/blocks.php
index 01cc2070ac779..22af83b55b5ae 100644
--- a/src/wp-includes/blocks.php
+++ b/src/wp-includes/blocks.php
@@ -129,6 +129,7 @@ function get_block_asset_url( $path ) {
  *
  * @since 5.5.0
  * @since 6.1.0 Added `$index` parameter.
+ * @since 6.5.0 Added ability for reading a custom script handle from the block asset file.
  *
  * @param array  $metadata   Block metadata.
  * @param string $field_name Field name to pick from metadata.
@@ -142,22 +143,21 @@ function register_block_script_handle( $metadata, $field_name, $index = 0 ) {
 		return false;
 	}
 
-	$script_handle = $metadata[ $field_name ];
-	if ( is_array( $script_handle ) ) {
-		if ( empty( $script_handle[ $index ] ) ) {
+	$script_handle_or_path = $metadata[ $field_name ];
+	if ( is_array( $script_handle_or_path ) ) {
+		if ( empty( $script_handle_or_path[ $index ] ) ) {
 			return false;
 		}
-		$script_handle = $script_handle[ $index ];
+		$script_handle_or_path = $script_handle_or_path[ $index ];
 	}
 
-	$script_path = remove_block_asset_path_prefix( $script_handle );
-	if ( $script_handle === $script_path ) {
-		return $script_handle;
+	$script_path = remove_block_asset_path_prefix( $script_handle_or_path );
+	if ( $script_handle_or_path === $script_path ) {
+		return $script_handle_or_path;
 	}
 
 	$path                  = dirname( $metadata['file'] );
 	$script_asset_raw_path = $path . '/' . substr_replace( $script_path, '.asset.php', - strlen( '.js' ) );
-	$script_handle         = generate_block_asset_handle( $metadata['name'], $field_name, $index );
 	$script_asset_path     = wp_normalize_path(
 		realpath( $script_asset_raw_path )
 	);
@@ -177,6 +177,14 @@ function register_block_script_handle( $metadata, $field_name, $index = 0 ) {
 		return false;
 	}
 
+	$script_asset  = require $script_asset_path;
+	$script_handle = isset( $script_asset['handle'] ) ?
+		$script_asset['handle'] :
+		generate_block_asset_handle( $metadata['name'], $field_name, $index );
+	if ( wp_script_is( $script_handle, 'registered' ) ) {
+		return $script_handle;
+	}
+
 	$script_path_norm = wp_normalize_path( realpath( $path . '/' . $script_path ) );
 	$script_uri       = get_block_asset_url( $script_path_norm );
 
@@ -185,13 +193,13 @@ function register_block_script_handle( $metadata, $field_name, $index = 0 ) {
 		$script_args['strategy'] = 'defer';
 	}
 
-	$script_asset        = require $script_asset_path;
 	$script_dependencies = isset( $script_asset['dependencies'] ) ? $script_asset['dependencies'] : array();
+	$block_version       = ! $is_core_block && isset( $metadata['version'] ) ? $metadata['version'] : false;
 	$result              = wp_register_script(
 		$script_handle,
 		$script_uri,
 		$script_dependencies,
-		isset( $script_asset['version'] ) ? $script_asset['version'] : false,
+		isset( $script_asset['version'] ) ? $script_asset['version'] : $block_version,
 		$script_args
 	);
 	if ( ! $result ) {
diff --git a/tests/phpunit/data/blocks/notice/shared-script.asset.php b/tests/phpunit/data/blocks/notice/shared-script.asset.php
new file mode 100644
index 0000000000000..d35471c73db2a
--- /dev/null
+++ b/tests/phpunit/data/blocks/notice/shared-script.asset.php
@@ -0,0 +1,7 @@
+<?php
+
+return array(
+	'handle'       => 'tests-my-shared-script',
+	'dependencies' => array(),
+	'version'      => 'test',
+);
diff --git a/tests/phpunit/data/blocks/notice/shared-script.js b/tests/phpunit/data/blocks/notice/shared-script.js
new file mode 100644
index 0000000000000..a9abbdbcc3d20
--- /dev/null
+++ b/tests/phpunit/data/blocks/notice/shared-script.js
@@ -0,0 +1 @@
+/* Another test JavaScript file. */
diff --git a/tests/phpunit/tests/blocks/register.php b/tests/phpunit/tests/blocks/register.php
index 3e55206037e40..3c583187d01c8 100644
--- a/tests/phpunit/tests/blocks/register.php
+++ b/tests/phpunit/tests/blocks/register.php
@@ -52,11 +52,18 @@ public function render_stub() {}
 	 * @since 5.0.0
 	 */
 	public function tear_down() {
-		$registry = WP_Block_Type_Registry::get_instance();
+		// Removes test block types registered by test cases.
+		$block_types = WP_Block_Type_Registry::get_instance()->get_all_registered();
+		foreach ( $block_types as $block_type ) {
+			$block_name = $block_type->name;
+			if ( str_starts_with( $block_name, 'tests/' ) ) {
+				unregister_block_type( $block_name );
+			}
+		}
 
-		foreach ( array( 'core/test-static', 'core/test-dynamic', 'tests/notice' ) as $block_name ) {
-			if ( $registry->is_registered( $block_name ) ) {
-				$registry->unregister( $block_name );
+		foreach ( wp_scripts()->registered as $script_handle ) {
+			if ( str_starts_with( $script_handle, 'tests-' ) ) {
+				wp_deregister_script( $script_handle );
 			}
 		}
 
@@ -134,26 +141,26 @@ public function test_removes_block_asset_path_prefix_and_current_directory() {
 	 * @ticket 50263
 	 */
 	public function test_generate_block_asset_handle() {
-		$block_name = 'unit-tests/my-block';
+		$block_name = 'tests/my-block';
 
 		$this->assertSame(
-			'unit-tests-my-block-editor-script',
+			'tests-my-block-editor-script',
 			generate_block_asset_handle( $block_name, 'editorScript' )
 		);
 		$this->assertSame(
-			'unit-tests-my-block-script',
+			'tests-my-block-script',
 			generate_block_asset_handle( $block_name, 'script', 0 )
 		);
 		$this->assertSame(
-			'unit-tests-my-block-view-script-100',
+			'tests-my-block-view-script-100',
 			generate_block_asset_handle( $block_name, 'viewScript', 99 )
 		);
 		$this->assertSame(
-			'unit-tests-my-block-editor-style-2',
+			'tests-my-block-editor-style-2',
 			generate_block_asset_handle( $block_name, 'editorStyle', 1 )
 		);
 		$this->assertSame(
-			'unit-tests-my-block-style',
+			'tests-my-block-style',
 			generate_block_asset_handle( $block_name, 'style' )
 		);
 	}
@@ -226,7 +233,7 @@ public function test_wrong_array_index_do_not_register_block_script_handle() {
 	public function test_missing_asset_file_register_block_script_handle() {
 		$metadata = array(
 			'file'   => __FILE__,
-			'name'   => 'unit-tests/test-block',
+			'name'   => 'tests/sample-block',
 			'script' => 'file:./blocks/notice/missing-asset.js',
 		);
 		$result   = register_block_script_handle( $metadata, 'script' );
@@ -264,14 +271,14 @@ public function test_handles_passed_register_block_script_handles() {
 	public function test_success_register_block_script_handle() {
 		$metadata = array(
 			'file'   => DIR_TESTDATA . '/blocks/notice/block.json',
-			'name'   => 'unit-tests/test-block',
+			'name'   => 'tests/sample-block',
 			'script' => 'file:./block.js',
 		);
 		$result   = register_block_script_handle( $metadata, 'script' );
 
-		$this->assertSame( 'unit-tests-test-block-script', $result );
+		$this->assertSame( 'tests-sample-block-script', $result );
 
-		// Test the behavior directly within the unit test
+		// Test the behavior directly within the unit test.
 		$this->assertFalse(
 			strpos(
 				wp_normalize_path( realpath( dirname( $metadata['file'] ) . '/' . $metadata['script'] ) ),
@@ -287,6 +294,51 @@ public function test_success_register_block_script_handle() {
 		);
 	}
 
+	/**
+	 * @ticket TBD...
+	 */
+	public function test_success_register_block_script_handle_with_custom_handle_name() {
+		$custom_script_handle = 'tests-my-shared-script';
+		$metadata             = array(
+			'file'   => DIR_TESTDATA . '/blocks/notice/block.json',
+			'name'   => 'tests/sample-block',
+			'script' => 'file:./shared-script.js',
+		);
+		$result               = register_block_script_handle( $metadata, 'script' );
+
+		$this->assertSame( $custom_script_handle, $result );
+		$this->assertStringEndsWith(
+			'shared-script.js',
+			wp_scripts()->registered[ $custom_script_handle ]->src
+		);
+	}
+
+	/**
+	 * @ticket TBD...
+	 */
+	public function test_reuse_registered_block_script_handle_with_custom_handle_name() {
+		$custom_script_handle = 'tests-my-shared-script';
+		$custom_script_src    = 'https://example.com/foo.js';
+		wp_register_script( $custom_script_handle, $custom_script_src );
+
+		$this->assertTrue(
+			wp_script_is( $custom_script_handle, 'registered' )
+		);
+
+		$metadata = array(
+			'file'   => DIR_TESTDATA . '/blocks/notice/block.json',
+			'name'   => 'tests/sample-block',
+			'script' => 'file:./shared-script.js',
+		);
+		$result   = register_block_script_handle( $metadata, 'script' );
+
+		$this->assertSame( $custom_script_handle, $result );
+		$this->assertSame(
+			$custom_script_src,
+			wp_scripts()->registered[ $custom_script_handle ]->src
+		);
+	}
+
 	/**
 	 * @ticket 55513
 	 */
@@ -440,21 +492,21 @@ public function test_handles_passed_register_block_style_handles() {
 	public function test_success_register_block_style_handle() {
 		$metadata = array(
 			'file'  => DIR_TESTDATA . '/blocks/notice/block.json',
-			'name'  => 'unit-tests/test-block',
+			'name'  => 'tests/sample-block',
 			'style' => 'file:./block.css',
 		);
 		$result   = register_block_style_handle( $metadata, 'style' );
 
-		$this->assertSame( 'unit-tests-test-block-style', $result );
-		$this->assertFalse( wp_styles()->get_data( 'unit-tests-test-block-style', 'rtl' ) );
+		$this->assertSame( 'tests-sample-block-style', $result );
+		$this->assertFalse( wp_styles()->get_data( 'tests-sample-block-style', 'rtl' ) );
 
-		// @ticket 50328
+		// @ticket 50328.
 		$this->assertSame(
 			wp_normalize_path( realpath( DIR_TESTDATA . '/blocks/notice/block.css' ) ),
-			wp_normalize_path( wp_styles()->get_data( 'unit-tests-test-block-style', 'path' ) )
+			wp_normalize_path( wp_styles()->get_data( 'tests-sample-block-style', 'path' ) )
 		);
 
-		// Test the behavior directly within the unit test
+		// Test the behavior directly within the unit test.
 		$this->assertFalse(
 			strpos(
 				wp_normalize_path( realpath( dirname( $metadata['file'] ) . '/' . $metadata['style'] ) ),
@@ -483,7 +535,7 @@ public function test_register_block_style_handle_should_load_rtl_stylesheets_for
 
 		$metadata = array(
 			'file'  => DIR_TESTDATA . '/blocks/notice/block.json',
-			'name'  => 'unit-tests/test-block-rtl',
+			'name'  => 'tests/sample-block-rtl',
 			'style' => 'file:./block.css',
 		);
 
@@ -491,14 +543,14 @@ public function test_register_block_style_handle_should_load_rtl_stylesheets_for
 		$wp_locale->text_direction = 'rtl';
 
 		$handle       = register_block_style_handle( $metadata, 'style' );
-		$extra_rtl    = wp_styles()->get_data( 'unit-tests-test-block-rtl-style', 'rtl' );
-		$extra_suffix = wp_styles()->get_data( 'unit-tests-test-block-rtl-style', 'suffix' );
-		$extra_path   = wp_normalize_path( wp_styles()->get_data( 'unit-tests-test-block-rtl-style', 'path' ) );
+		$extra_rtl    = wp_styles()->get_data( 'tests-sample-block-rtl-style', 'rtl' );
+		$extra_suffix = wp_styles()->get_data( 'tests-sample-block-rtl-style', 'suffix' );
+		$extra_path   = wp_normalize_path( wp_styles()->get_data( 'tests-sample-block-rtl-style', 'path' ) );
 
 		$wp_locale->text_direction = $orig_text_dir;
 
 		$this->assertSame(
-			'unit-tests-test-block-rtl-style',
+			'tests-sample-block-rtl-style',
 			$handle,
 			'The handle did not match the expected handle.'
 		);
@@ -528,13 +580,13 @@ public function test_register_block_style_handle_should_load_rtl_stylesheets_for
 	public function test_register_nonexistent_stylesheet() {
 		$metadata = array(
 			'file'  => DIR_TESTDATA . '/blocks/notice/block.json',
-			'name'  => 'unit-tests/test-block-nonexistent-stylesheet',
+			'name'  => 'tests/sample-block-nonexistent-stylesheet',
 			'style' => 'file:./nonexistent.css',
 		);
 		register_block_style_handle( $metadata, 'style' );
 
 		global $wp_styles;
-		$this->assertFalse( $wp_styles->registered['unit-tests-test-block-nonexistent-stylesheet-style']->src );
+		$this->assertFalse( $wp_styles->registered['tests-sample-block-nonexistent-stylesheet-style']->src );
 	}
 
 	/**
@@ -638,13 +690,13 @@ public function test_block_registers_with_metadata_fixture() {
 			$result->provides_context
 		);
 		$this->assertSameSets( array( 'groupId' ), $result->uses_context );
-		// @ticket 57585
+		// @ticket 57585.
 		$this->assertSame(
 			array( 'root' => '.wp-block-notice' ),
 			$result->selectors,
 			'Block type should contain selectors from metadata.'
 		);
-		// @ticket 59346
+		// @ticket 59346.
 		$this->assertSameSets(
 			array(
 				'tests/before'      => 'before',
@@ -716,13 +768,13 @@ public function test_block_registers_with_metadata_fixture() {
 			$result->style_handles
 		);
 
-		// @ticket 50328
+		// @ticket 50328.
 		$this->assertSame(
 			wp_normalize_path( realpath( DIR_TESTDATA . '/blocks/notice/block.css' ) ),
-			wp_normalize_path( wp_styles()->get_data( 'unit-tests-test-block-style', 'path' ) )
+			wp_normalize_path( wp_styles()->get_data( 'tests-sample-block-style', 'path' ) )
 		);
 
-		// @ticket 53148
+		// @ticket 53148.
 		$this->assertIsCallable( $result->render_callback );
 	}