Hey, i got some News for you Maybe I found a fix for this Problem. For myself i got the UE4 Fatal Error Line 508 everytime i tried loading in on a Server. The game freezed on the PrimalGameData_PB Screen and showed me the Crash Message. I tried everything to fix it like everyone else but nothing worked.
But then i tried to update my BIOS to the newest Version (ASUS Prime Z270-A Mainboard) and it worked for me. Maybe this will fix the problems for some of u guys. Maybe its not working for everyone, since I was only able to test this for myself.