Can't vote or save a reply

Userscript built from master will let me write a reply to a post comment, but won't let me save it (cancelling works fine, though). Upvoting and downvoting other comments doesn't work, either.

Web browser: GNU Icecat 60.7.0
Userscript extension: Violentmonkey 2.11.2
Operating system: Parabola GNU+Linux-libre