Traffic source on S2S VPN tunnel

[greY]

hey

I see some packets are being blocked coming from a S2S wireguard tunnel to the OPNSENSE. On the other side (also OPNSENSE) I don's see any device that is talking on that port.

Does anybody have an idea how to investigate that?

Topology is:
OPNSENSE1 <---S2S WG-->OPNSENSE2

thx