Ok, it seems not to be related to Unity or DLLs, though it means broken Unreal debugger.
Firstly, if I go several commits ago before some blueprint changes, game won’t crash, I managed to find the latest commit where it works and probably will have to start from there.
Secondly, some hints are actually about it’s internal problem of game code (on screenshot it’s something related to GAS and input system)
The solution for now is to go back to latest working commit and try to find the change that caused this behaviour.