I believe at the v6 bump something in libalpm changed and it broke the way I had installed yay, at least. Took me a bit to fix because previously I'd just installed yay with go install and IIRC that didn't work to rebuild.
I updated two PCs yesterday and both were fairly far behind in updates. My main rig was without issue (it was about 4 weeks since last updated). A secondary pc that was a couple of months behind did have a weird issue with the mirrors being offline or something. This was using the default mirror lists. Pac-Man couldn’t find the repositories. Ran reflector and everything was fine again. I’m thinking the issue didn’t have anything to do with pacman.
Anyways - the pacman upgrade was uneventful (which was good)