Multiple <template> tags in the same file emits an error

[GrygrFlzr]

Describe the bug
Attempting to use multiple <template> tags in the same file emits an error:

</template> attempted to close an element that was not open
svelte(invalid-closing-tag)

To Reproduce

<template>
    <h1>Hello</h1>
</template>
<template>
    <h1>How are you</h1>
</template>

Expected behavior
No errors.

Screenshots

System:
Visual Studio Code on Windows

Version: 1.53.0 (user setup)
Commit: 8490d3dde47c57ba65ec40dd192d014fd2113496
Date: 2021-02-03T20:36:38.611Z
Electron: 11.2.1
Chrome: 87.0.4280.141
Node.js: 12.18.3
V8: 8.7.220.31-electron.0
OS: Windows_NT x64 10.0.19042

Plugin/Package: Svelte for VSCode (svelte.svelte-vscode) and confirmed the old extension is not installed.

Additional context
#694 is likely related (which is not fully fixed), as is FredKSchott/snowpack/discussions/2595.
EDIT: latter is related to svelte-preprocess insted at sveltejs/svelte-preprocess#310

It's likely that it is greedily parsing the contents from the first opening tag to the last closing tag.

I thought this may have been either a Svelte or HTML limitation at first, but it seems to work with no issues:

• in the REPL
• in a fresh instance of Svelte with Rollup
• in a fresh instance of Sapper with Rollup

This leads me to believe that multiple <template> tags is valid and it is the extension that is incorrect.

[dummdidumm]

#694 is unrelated, that's only highlighting. The problem is inside svelte-preprocess. Therefore I'll close this issue. We will bump the svelte-preprocess version once it's fixed other there, then the VS Code error should go away, too.