BUG on the Business version 24.10.2? Transparent bridge problems

[Wuensch-AG-Adm]

Dear OPNSense Community,

I'm trying to use one of our Business OPNSense in transparent bridge mode in one of our DMZ. The Bridge will work until I reboot the system. The appliance is an official Deciso OPNSense DEC3842.
The topology is not so complex but more complex than what we find on internet and forums in general. It's a 3-tier environnement and OPNSense isn't used for NATing. I've tried to integrate the OPNSense to scan the traffic (IPS/IDS, CrowdSec and the firewall) between the 1st and 2nd HOP of our Networks.
Every time I restart the appliance, I have to save the bridge interface again to restore to connections behind the OPNSense. If I don't do that, I can't access the various applications, remote sessions and https interfaces. It works for about 2 or 3 days then the connection is lost again. I press the "save" button and it works again.
The online applications are working without that because they're proxied by the OPNSense, but our intern connection between the network not. What is really strange and that's why I believe that's a problem from the OPNSense, I can access the UI of the OPNSense and nothing behind (the last time), sometimes I can access some of the UIs / RDP.

I've found a second problem and I think it's an effect of this bridge's problem. If I don't save the parameter from suricata again (IPS/IDS) the logs are filled with thousands of those lines: [101142] <Error> -- bridge0: error reading netmap data via polling: No buffer space available
Some times it's written also with bridge0^. I've found something about on internet but it doesn't match my case.
I just need to save the suricata configuration and it's gone and works as it should.

The topology looks something like this: 1st Hop Router (with NAT) -> OPNSense as transparent bridge + proxies connected to some Web Apps -> 2nd Hop Router (with NAT) -> application servers etc...

It seems that OPNSense is interfering with something in the communication between the routers. I've suspected something with ARP, but the last test with some static ARP entries (neighbors) has failed. Before the OPNSense we had a Sophos XG (in bridge mode too) and it has worked flawlessly. But with the EOL it was the time to change.

The only solution for me was to save the bridge and the IPS/IDS configuration again(interface bridge+lan).

Could you please help me?
I'll go into detail, when some information is needed. But it could be a really long topic, so I made this summary.

All the best

Regards

Joel T.