I believe this may be related to #563.
I have managed to reproduce it. The following consistently fails on my machine, but only on the second time I call markdown-edit-code-block
Some text.
```html
<template>
<SomeElement foo='bar' alice='bob'>
<table class='foobarbazfoo test.test'>
<thead>
<tr>
<th>Test</th>
<th>Test</th>
</tr>
</thead>
<tbody>
<tr class='test test foo_bar.test'>
<td><input prop-name='link.text'/></td>
</tr>
</tbody>
</table>
<div/>
</SomeElement>
</template>
```
I've reproduced it with emacs -q.
GNU Emacs 27.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.27, cairo version 1.17.4) of 2021-03-26
Arch Linux
markdown-mode 20210904.733
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