diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7134cfdb53c..eaf97bc6412 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,9 @@
 * Fixed incorrect deprecation warning when passing no parameter into `default()` (`init()`) or `initSync()`.
   [#4074](https://github.com/rustwasm/wasm-bindgen/pull/4074)
 
+* Fixed many proc-macro generated `impl` blocks missing `#[automatically_derived]`, affecting test coverage.
+  [#4078](https://github.com/rustwasm/wasm-bindgen/pull/4078)
+
 --------------------------------------------------------------------------------
 
 ## [0.2.93](https://github.com/rustwasm/wasm-bindgen/compare/0.2.92...0.2.93)
diff --git a/crates/backend/src/codegen.rs b/crates/backend/src/codegen.rs
index 4121ada5fdc..9a41621cb1e 100644
--- a/crates/backend/src/codegen.rs
+++ b/crates/backend/src/codegen.rs
@@ -222,7 +222,6 @@ impl ToTokens for ast::Struct {
         (quote! {
             #[automatically_derived]
             impl #wasm_bindgen::describe::WasmDescribe for #name {
-                #[cfg_attr(wasm_bindgen_unstable_test_coverage, coverage(off))]
                 fn describe() {
                     use #wasm_bindgen::__wbindgen_if_not_std;
                     use #wasm_bindgen::describe::*;
@@ -369,7 +368,7 @@ impl ToTokens for ast::Struct {
                 fn is_none(abi: &Self::Abi) -> bool { *abi == 0 }
             }
 
-            #[allow(clippy::all)]
+            #[automatically_derived]
             impl #wasm_bindgen::convert::TryFromJsValue for #name {
                 type Error = #wasm_bindgen::JsValue;
 
@@ -404,8 +403,8 @@ impl ToTokens for ast::Struct {
                 }
             }
 
+            #[automatically_derived]
             impl #wasm_bindgen::describe::WasmDescribeVector for #name {
-                #[cfg_attr(wasm_bindgen_unstable_test_coverage, coverage(off))]
                 fn describe_vector() {
                     use #wasm_bindgen::describe::*;
                     inform(VECTOR);
@@ -415,6 +414,7 @@ impl ToTokens for ast::Struct {
                 }
             }
 
+            #[automatically_derived]
             impl #wasm_bindgen::convert::VectorIntoWasmAbi for #name {
                 type Abi = <
                     #wasm_bindgen::__rt::alloc::boxed::Box<[#wasm_bindgen::JsValue]>
@@ -428,6 +428,7 @@ impl ToTokens for ast::Struct {
                 }
             }
 
+            #[automatically_derived]
             impl #wasm_bindgen::convert::VectorFromWasmAbi for #name {
                 type Abi = <
                     #wasm_bindgen::__rt::alloc::boxed::Box<[#wasm_bindgen::JsValue]>
@@ -441,6 +442,7 @@ impl ToTokens for ast::Struct {
                 }
             }
 
+            #[automatically_derived]
             impl #wasm_bindgen::__rt::VectorIntoJsValue for #name {
                 fn vector_into_jsvalue(vector: #wasm_bindgen::__rt::alloc::boxed::Box<[#name]>) -> #wasm_bindgen::JsValue {
                     #wasm_bindgen::__rt::js_value_vector_into_jsvalue(vector)
@@ -939,13 +941,14 @@ impl ToTokens for ast::ImportType {
                 use #wasm_bindgen::{JsValue, JsCast, JsObject};
                 use #wasm_bindgen::__rt::core;
 
+                #[automatically_derived]
                 impl WasmDescribe for #rust_name {
-                    #[cfg_attr(wasm_bindgen_unstable_test_coverage, coverage(off))]
                     fn describe() {
                         #description
                     }
                 }
 
+                #[automatically_derived]
                 impl IntoWasmAbi for #rust_name {
                     type Abi = <JsValue as IntoWasmAbi>::Abi;
 
@@ -955,6 +958,7 @@ impl ToTokens for ast::ImportType {
                     }
                 }
 
+                #[automatically_derived]
                 impl OptionIntoWasmAbi for #rust_name {
                     #[inline]
                     fn none() -> Self::Abi {
@@ -962,6 +966,7 @@ impl ToTokens for ast::ImportType {
                     }
                 }
 
+                #[automatically_derived]
                 impl<'a> OptionIntoWasmAbi for &'a #rust_name {
                     #[inline]
                     fn none() -> Self::Abi {
@@ -969,6 +974,7 @@ impl ToTokens for ast::ImportType {
                     }
                 }
 
+                #[automatically_derived]
                 impl FromWasmAbi for #rust_name {
                     type Abi = <JsValue as FromWasmAbi>::Abi;
 
@@ -980,11 +986,13 @@ impl ToTokens for ast::ImportType {
                     }
                 }
 
+                #[automatically_derived]
                 impl OptionFromWasmAbi for #rust_name {
                     #[inline]
                     fn is_none(abi: &Self::Abi) -> bool { *abi == 0 }
                 }
 
+                #[automatically_derived]
                 impl<'a> IntoWasmAbi for &'a #rust_name {
                     type Abi = <&'a JsValue as IntoWasmAbi>::Abi;
 
@@ -994,6 +1002,7 @@ impl ToTokens for ast::ImportType {
                     }
                 }
 
+                #[automatically_derived]
                 impl RefFromWasmAbi for #rust_name {
                     type Abi = <JsValue as RefFromWasmAbi>::Abi;
                     type Anchor = core::mem::ManuallyDrop<#rust_name>;
@@ -1007,6 +1016,7 @@ impl ToTokens for ast::ImportType {
                     }
                 }
 
+                #[automatically_derived]
                 impl LongRefFromWasmAbi for #rust_name {
                     type Abi = <JsValue as LongRefFromWasmAbi>::Abi;
                     type Anchor = #rust_name;
@@ -1019,6 +1029,7 @@ impl ToTokens for ast::ImportType {
                 }
 
                 // TODO: remove this on the next major version
+                #[automatically_derived]
                 impl From<JsValue> for #rust_name {
                     #[inline]
                     fn from(obj: JsValue) -> #rust_name {
@@ -1026,17 +1037,20 @@ impl ToTokens for ast::ImportType {
                     }
                 }
 
+                #[automatically_derived]
                 impl AsRef<JsValue> for #rust_name {
                     #[inline]
                     fn as_ref(&self) -> &JsValue { self.obj.as_ref() }
                 }
 
+                #[automatically_derived]
                 impl AsRef<#rust_name> for #rust_name {
                     #[inline]
                     fn as_ref(&self) -> &#rust_name { self }
                 }
 
 
+                #[automatically_derived]
                 impl From<#rust_name> for JsValue {
                     #[inline]
                     fn from(obj: #rust_name) -> JsValue {
@@ -1044,6 +1058,7 @@ impl ToTokens for ast::ImportType {
                     }
                 }
 
+                #[automatically_derived]
                 impl JsCast for #rust_name {
                     fn instanceof(val: &JsValue) -> bool {
                         #[link(wasm_import_module = "__wbindgen_placeholder__")]
@@ -1592,7 +1607,7 @@ impl ToTokens for ast::Enum {
                 }
             }
 
-            #[allow(clippy::all)]
+            #[automatically_derived]
             impl #wasm_bindgen::convert::TryFromJsValue for #enum_name {
                 type Error = #wasm_bindgen::JsValue;
 
@@ -1609,8 +1624,8 @@ impl ToTokens for ast::Enum {
                 }
             }
 
+            #[automatically_derived]
             impl #wasm_bindgen::describe::WasmDescribeVector for #enum_name {
-                #[cfg_attr(wasm_bindgen_unstable_test_coverage, coverage(off))]
                 fn describe_vector() {
                     use #wasm_bindgen::describe::*;
                     inform(VECTOR);
@@ -1618,6 +1633,7 @@ impl ToTokens for ast::Enum {
                 }
             }
 
+            #[automatically_derived]
             impl #wasm_bindgen::convert::VectorIntoWasmAbi for #enum_name {
                 type Abi = <
                     #wasm_bindgen::__rt::alloc::boxed::Box<[#wasm_bindgen::JsValue]>
@@ -1631,6 +1647,7 @@ impl ToTokens for ast::Enum {
                 }
             }
 
+            #[automatically_derived]
             impl #wasm_bindgen::convert::VectorFromWasmAbi for #enum_name {
                 type Abi = <
                     #wasm_bindgen::__rt::alloc::boxed::Box<[#wasm_bindgen::JsValue]>
@@ -1644,6 +1661,7 @@ impl ToTokens for ast::Enum {
                 }
             }
 
+            #[automatically_derived]
             impl #wasm_bindgen::__rt::VectorIntoJsValue for #enum_name {
                 fn vector_into_jsvalue(vector: #wasm_bindgen::__rt::alloc::boxed::Box<[#enum_name]>) -> #wasm_bindgen::JsValue {
                     #wasm_bindgen::__rt::js_value_vector_into_jsvalue(vector)
diff --git a/crates/cli/tests/reference/raw.js b/crates/cli/tests/reference/raw.js
index 6b831debb89..3432d150366 100644
--- a/crates/cli/tests/reference/raw.js
+++ b/crates/cli/tests/reference/raw.js
@@ -6,26 +6,6 @@ export function __wbg_set_wasm(val) {
 }
 
 
-const heap = new Array(128).fill(undefined);
-
-heap.push(undefined, null, true, false);
-
-function getObject(idx) { return heap[idx]; }
-
-let heap_next = heap.length;
-
-function dropObject(idx) {
-    if (idx < 132) return;
-    heap[idx] = heap_next;
-    heap_next = idx;
-}
-
-function takeObject(idx) {
-    const ret = getObject(idx);
-    dropObject(idx);
-    return ret;
-}
-
 const lTextDecoder = typeof TextDecoder === 'undefined' ? (0, module.require)('util').TextDecoder : TextDecoder;
 
 let cachedTextDecoder = new lTextDecoder('utf-8', { ignoreBOM: true, fatal: true });
@@ -45,6 +25,26 @@ function getStringFromWasm0(ptr, len) {
     ptr = ptr >>> 0;
     return cachedTextDecoder.decode(getUint8ArrayMemory0().subarray(ptr, ptr + len));
 }
+
+const heap = new Array(128).fill(undefined);
+
+heap.push(undefined, null, true, false);
+
+function getObject(idx) { return heap[idx]; }
+
+let heap_next = heap.length;
+
+function dropObject(idx) {
+    if (idx < 132) return;
+    heap[idx] = heap_next;
+    heap_next = idx;
+}
+
+function takeObject(idx) {
+    const ret = getObject(idx);
+    dropObject(idx);
+    return ret;
+}
 /**
 * @param {number} test
 * @returns {number}
@@ -110,11 +110,11 @@ export function __wbg_test2_39fe629b9aa739cf() {
     return addHeapObject(ret);
 };
 
-export function __wbindgen_object_drop_ref(arg0) {
-    takeObject(arg0);
-};
-
 export function __wbindgen_throw(arg0, arg1) {
     throw new Error(getStringFromWasm0(arg0, arg1));
 };
 
+export function __wbindgen_object_drop_ref(arg0) {
+    takeObject(arg0);
+};
+