I'm using duckduckgo and Windows 11 and I have trouble quoting, but found if I originally click on "go to last post" (from the Today's posts) that at least I can type in "Quick Reply." I've noticed some other differences in the last 24 hours, as some of the icons in the post are different and have " Default" after the icon and before of the title.
See also
Is anyone else having a problem making a reply to a thread? particularly post #4 by peckish.