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I ran into those first two issues you mentioned after the upgrade as well. Unfortunately my notes on how I fixed it aren't very good - they're intermixed with debugging a separate issue WireGuard-related issue - but I think (see edit) the fix may have been resetting all tunables to their default values, then rebooting. Definitely make a backup, though.
EDIT: My memory was jogged by another thread - the other thing that may have been the cause was an issue with WireGuard overwriting the default DNS server (see https://forum.opnsense.org/index.php?topic=23591.msg112239#msg112239), which breaks HAProxy and various other things. If you're running WireGuard, look through your local endpoints and see if any of them have a custom DNS server set. I think this is the more likely solution than the original one.
Good luck.
EDIT: My memory was jogged by another thread - the other thing that may have been the cause was an issue with WireGuard overwriting the default DNS server (see https://forum.opnsense.org/index.php?topic=23591.msg112239#msg112239), which breaks HAProxy and various other things. If you're running WireGuard, look through your local endpoints and see if any of them have a custom DNS server set. I think this is the more likely solution than the original one.
Good luck.
