I had some issues with rc2 on windows. It was crashing and I had to restart 10 times to finally use it (bitcoind and bitcoin-qt). Could not find anything in logs. Never had this issue with any release in past.
for both it's a matter of rebasing our patches under bitcoin-core on the new main branch and doing the subtree incantations; there may be some build system work involved too, though, especially around the ARM special instruction sets
I've been lurking this channel for a while via the matrix bridge and just lost access last night or today with this message from the bridge "Could not join #bitcoin-core-dev on 'irc.libera.chat': err_needreggednick". I'm not expecting anybody to accomodate me wanting to lurk via the bridge if there was a reason it was closed off, but on the off chance it was closed off by accident...