have a look at your starting parameters in Steam, there are a few strange things to notice:
2023-04-19T15:51:55 0.072 INF Command line arguments: 7DaysToDie -logfile E:\SteamCheckout\testing_trunk-windows-client\\7DaysToDie_Data\output_log__2023-04-19__15-51-54.txt -quit -batchmode -nographics -configfile=serverconfig.xml -dedicated
-quit
-batchmode
-nographics <-- THIS is the reason for your NullGfxDevice
-configfile=serverconfig.xml
-dedicated
is this a server or a client installation? For a client installation they are all not needed (remove them completeley).
and btw., "testing_trunk"?