Code block within spoiler gives different result than shown in preview about stacks-editor HOT 2 OPEN

This isn't exactly a bug in the editor, but rather the fact that the server-side Markdown renderer doesn't support any type of block Markdown formatting in spoilers. The real fix here is to fix the server-side renderer so it supports block formatting in spoilers. In my view, that's unlikely to happen, as that issue has been reported for many years and never gotten any response from Stack Exchange indicating any intent to fix it, even as many duplicates of that issue have been posted over the years, some of which have been closed by Stack Exchange staff.

The only issue with the Stacks editor is that it incorrectly displays block Markdown formatting correctly, even though the server-side renderer doesn't support it. I do believe that there shouldn't be any discrepancy between the client-side preview and the server-side rendered post. Until such time as the server-side renderer supports block Markdown formatting, the Stacks editor shouldn't correctly display it since it won't be rendered on the server. Alternatively, it should use HTML formatting inside spoilers (since the server-side renderer does support HTML block formatting).

from stacks-editor.

Is it possible that spoilers could be made into a block element, like <spoiler></spoiler>?

from stacks-editor.