Firefox - Comment disappears when posting

When a comment is submitted, the edit window disappears and the comment never shows up in the thread, even after reloading the page. Happens semi-randomly but fairly often. Usually submitting the comment again succeeds. Might be related to the length of time it takes to type up the comment before submitting? Hard to tell for sure. This is new behavior, just started happening in the last few weeks.

Firefox 134.0.2, Windows 11