Ok well - The majority of the issue is that the mainline release from steamDB is still 1.1 even tho the depot says v1.2 is 'gold' , it's still pushing 1.1 unless you select -beta v1.2 branch.
So, that's resolved with a little tweak to the bat .
Now the issue seems to be a silent disconnect on join, for an unknown reason. I've tried both enabling as well as disabling litenet and steamnetworking.
Server instance is on same network segment as the testClient, so it's odd.
I have a rebirth instance as well as a vanilla instance on that same box and testing both from the same client work fine. It's only the instance with Afterlife that throws this deserialize error.
//--2025-01-09T18:12:14 265.081 ERR NCSimple_Deserializer (cl=EOS_0002233e54d84918954010de541784c2, ch=0) Message: Parsed data size (257) does not match expected size (278) in NetPackagePlayerDisconnect
2025-01-09T18:12:14 265.091 EXC Parsed data size (257) does not match expected size (278) in NetPackagePlayerDisconnect//
I am going to call it quits on this for the night, but just wanted to add some more context in case anyone else comes here with an issue. At least they will know they aren't alone.
I'm going to spin up wireshark on a linux VM in that same segment just to see if anything looks peculiar on framing, MSS< etc. but its probably just something fucky with the map, the host, or some other rando issue. Doubt its mod code, but like i said, wanted to put this here just in case.