problem with Wireguard server (OPNsense) and Linux clints

[spaccabits]

after some updates (no idea which is the offender) of Debian 11/Mint LMDE 5 machines and the router (OPNsense, currently at 23.1.5_4-amd64), there is no possibility to browse then LAN or the WEB after connected via Wireguard.

from terminal everything seems to work (ping and tracepath on various domains and LAN addresses, ssh on LAN machines, sshfs connects requested resource regularly, then timesout when trying to do a simple ls - I haven't tried nfs nor sftp , the shares are temporary -), but as soon as I try to access whatever it doesn't do anything anymore and the result is always a timeout ...
the most curious thing is that if I do the same operations from an Android tablet everything works perfectly, I have a (personal) FritzOS 7.50 router (to another LAN) and even with this everything seems to work; so the problem would seem to be between OPNsense and Linux, Linux in particular because if everything works from Android, but the suspect remains OPNsense, because until the latest updates everything worked ...
what could be the problem? version problem?

further details:
Android Wireguard version 1.0.20230412 (from Google Play)
OPNsense Wireguard version (FreeBSD 13.1) 1.13_5
Wireguard Linux version 1.0.2.20210223-1
Linux kernel 5.10.0-21
Network Manager 1.20
resolvectl on link Wireguard Current Scopes: none

sorry for my bad english (Google Traslate  )