There seems to be a problem with autocorrect in LibreOffice in Hirsute/MATE. There is no auto-capitalization of first words in a sentence, and the replacement table is not being implemented.
This exact issue came up in a Fedora 34 prerelease back in February, and eventually resolved itself with a system update. We were never able to figure out what package fixed it, but it wasn't an update to LO. In any case, I have tried older versions of LO that formerly worked fine, and now also show this bug.
So I'm guessing that this is NOT a bug in LO, or at most, it's an interaction between LO and some 'plumbing'. It's some system component that is causing this. I logged in to Hirsute after being away for a couple of weeks, and after updating, this bug was evident. I picked up 200 and something updates, so hard to say what is responsible.
Anyone have any idea what's going on? Release is tomorrow?