The update for UE and for 4090 came out today. I updated both at once and launched the scene. I noticed immediately how much faster everything started working. That’s nice. On the downside, the scene still crashes, but now ONLY when Ultra Dynamic Weather is added. As soon as they release an update to 5.5 I will test again. No good news so far.
UPD:
By trial and error I came to the conclusion that the scene crashes at any settings if the “storm” preset in UDW is set. If you change it to any other setting, everything is fine. I think it has to do with some particles or something, but it’s not my problem.
I found the bug and I’m waiting for my Unreal Engine fun t-shirt!