I know that this is not supported officially. But maybe you can give me a hint nevertheless.
UE4 applications crash in wine, showing the following error:
Error: Assertion failed: Count >= 0 [File:d:\build++portal+release-live+compile\sync\engine\source\runtime\core\public\Containers/UnrealString.h] [Line: 1153]
I believe that the error is related to a change of the UE4 version. E.g. Epic Games Launcher 2.12.14-3176191 worked, 2.12.16-3214896 does not work anymore.