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I did some more testing on 25.1b_20.
For testing purposes, without connecting the box directly to the internet via WAN interface, i always assign an IP address to the LAN interface as well as the IP address of the default gateway and DNS using console menu item 2). The WAN interface stays unconfigured.
I changed this procedure for my last test, skipping the configuration of the default gateway and voila OPNsense GUI was accessible. Then i added a default gateway for the LAN interface and immediately after applying the configuration the OPNsense GUI was no longer accessible (until i use pfctl -d and disable the gateway). I repeated this several times, always experiencing the same behaviour.

I looked a bit closer and found that the Default deny / state violation rule blocks traffic on both SG330 and PVE installation of 25.1

I then installed 25.1 on PVE with the same effect as described for my SG330: no gui logon possible.
After i disabled pf via console i was able to logon.

I have a Sophos SG330 for testing purposes.
OPNsense 24.7 was installed and running on that machine. I changed the firmware type to "Development" and installed 25.1. After the reboot was completed i was no longer able to access opnsense (web gui as well as ssh) but it did replay to ping.
After that i downloaded the 25.1 image and did a clean install. Same problem as before. So i installed 24.7 again, all fine.