After submitting an HTML sample in this post, #Lemmy gutted the content silently and destructively without telling me. The original text is totally lost and not recoverable. I only noticed because more than half the code was discarded.

This is terrible. It’s perhaps understandable that raw HTML might have security issues if it appears as-is, so of course the angle brackets should be automatically encoded as literals by the submission processing modules. The status quo is obviously a #LemmyBug because authors are not even warned about the destruction and given a chance to preserve their work. It just gets trashed.