We’re working on the bug, but evidently it’s one of the top crashes out there at the moment. If you are running into engine crashes when rendering a Niagara system using a GPU simulation target to EXRs or PNG16s, you can try adding this cvar to MRQ/MRG to mitigate crashes until we can get a proper fix out there.
fx.Niagara.Batcher.TickFlush.Mode 0