Incorrect SSR Rendering

[hit12369]

Version

3.2.33

Reproduction link

stackblitz.com

Steps to reproduce

SSR renders nothing if a fragment is inside a slot. This causes hydration mismatch.

What is expected?

SSR renders nothing, but should render Hello World

What is actually happening?

SSR renders nothing and causes hydration mismatch.

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This seems to be happening because isComment function in ssrRenderSlot returns true in case of fragments because of incorrect regex.

core/packages/server-renderer/src/helpers/ssrRenderSlot.ts

Lines 65 to 68 in 9c304bf

	const commentRE = /^<!--.*-->$/
	function isComment(item: SSRBufferItem) {
	return typeof item === 'string' && commentRE.test(item)
	}