@RedAsset I think this will annoy you at the same time it solves the problem.
<div class='className'>
|table-cell|table-cell|
*list-item
*list-item
*list-item
</div>
When using html in wiki text you need to place a blank line after it so the parser switches to wiki text rendering, otherwise it is placed inside a paragraph with the html and things go sour. You also need to do this with say <hr>
and any tag, including inside a details tag.
<details><summary>title</summary>
! wikitext
</details>
When you have problems like this use tiddlywiki.com where the “internals” plugin is already installed. You then can edit the tiddler and preview the output or the generated HTML to see how it is breaking.
Keep in mind this is only an issue when mixing HTML and wikitext
I personally abandoned using wikitext tables which I always had difficulty with and use full html tables now - sometimes with rows and/or columns constructed inside list widgets.
Please mark as solved if I have in fact done so.