Same problem here. I removed the wireguard interface from my zenarmor settings and now I'm able to connect again. Hopefully they get it fixed soon.
Did you send feedback/logs to Sunneyvalley through the UI? Have you had any feedback from them?
I think I had this problem, too. Right after 24.7.7 update WG stops to work. I always saw a 124kb received from WG/OPNsense (e.g. on my iPhone), then it stops. However, after some restarts this problem is just gone. WG works as expected and I haven't touched anything. Strange.See here: https://forum.opnsense.org/index.php?topic=43653.0So maybe it is not related to Zenarmor?