Just in case it might help anyone else: For some reason this was caused by the gamemode trying to load the player pawn by default. I’ve just uncommented these lines in my gamemode.cpp and that fixed it for me. I assume it has something to do in which order Niagara + Pawn are loaded etc.
I stumbled upon this running the game via Visual Studio, with the Local Windows Debugger attached. Similar to what was suggested here by ‘Scapior’:
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