wireguard not passing traffic?

[nerd]

SO, I have been running OPNsense with wireguard on top of it for quite a while now, but have recently noticed my wireguard setup isn't working anymore.
Both my peer devices (mobile phone and laptop) are having issues.
FW has a rule to allow any to WAN_addr udp 1234
A record remote.domain.tld resolves to this WAN_addr
I have wg0 tied into my VPN interface and have a VPN_net alow any any rule set.
Tunnel address is an internal subnet x.y.z.1/24.
Peer endpoint address is remote.domain.tld:1234 (non-default port).
Peer address is x.y.z.2/32 and x.y.z.3/32
Peers allowed IPs is 0.0.0/0

Symptoms:
Peer shows tunnel state active, I can see traffic sent (on the peer), but none received.
Interface shows status up, but down for both peers and transfer sent/receive does not move. Any way to reset these statistics?

Why is this not working anymore?

[hansdampf]

Same here! I tried to add a new client, but the problem is still there. :(