Markdown Spoiler not working

Spoilers were added in v0.20.0, but they aren't working anymore.
Tried it like the the release notes said with `||Invisible text||`, but it spoilers itself.

<img width="686" height="183" alt="Image" src="https://github.com/user-attachments/assets/166e7cd4-5eb5-475a-a42f-0dd235bda087" />