Visually the two together look just fine, but theres issues with connecting to other players with the same combo. Connecting client gets kicked, host logs just report a regular disconnect message. Ive brought this up with the owner of FGM and basically got told "not my problem", which is why I'm bringing this here. I honestly don't know why these two are having issues in multiplayer scenarios, other than that they obviously touch the player model. I tried to use figura instead, but couldnt get the result I wanted.
Anyway. It would be really nice if you could do some magic and fix the disconnecting issue. Could be easy could be impossible I dont know. Ill post the connecting client logs if I can find em. Thanks for your time.

Heres the link for what I posted on wildfires github. Its old but the disconnect message hasnt changed at all.

The crash linked on that other git is inside the network handler. This mod doesn't touch anything close to that, so it's 99% unrelated(added to that, there is nothing special about lan worlds).