Any update on this?
I am experiencing the exact same thing all of the sudden out of nowhere. I upgraded from 2.7 to 2.7.1, but this didn’t happen until a little bit after that – at least a day or two after.
In my admin dashboard it says I have no categories and no tags – but the terms table still has all my categories and tags in it. I tried repairing the database tables, but that made no difference. All my posts show as uncategorized.