Likely a regression from T73220 (https://gerrit.wikimedia.org/r/#/c/288564/)
Before, it showed the no JS one while loading (but grayed out to be inaccessible). However, it should never show both at the same time next to each other like that.
Change 298722 had a related patch set uploaded (by Sbisson):
Don't show 'start a new topic twice'
Change 298722 merged by jenkins-bot:
Don't show 'start a new topic' twice
Checked in betalabs - no double 'Start a new topic' forms is displayed.