The editor crashed with
LogSlate: External Image Picker: DecompressImage failed
The solution was to update the DefaultEngine.ini section [/Script/Engine.RendererSettings]
I did not went through trial & error to pin down the exact setting or combination of settings leading to this editor crash, but removing some more exotic and a double entry did the trick.
The crash window error
Unhandled Exception: EXCEPTION_ACCESS_VIOLATION writing address 0x000000002000000c
amdxc64
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D3D12Core
D3D12Core
D3D12Core
D3D12Core
D3D12Core
D3D12
D3D12Core
UnrealEditor_D3D12RHI
UnrealEditor_D3D12RHI
UnrealEditor_RHI
UnrealEditor_RHI
UnrealEditor_RHI
UnrealEditor_RHI
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
kernel32
ntdll