Looks like just saving regularly can also trigger the crash, happened to me right outside Kemm's Mansion where there are a lot of merchants around, after I casted spirit vision. I suspect that too many NPCs hanging around might trigger the crash because the game got noticably laggier than usual during the initial saving process.
The reason I brought up spirit vision is that I was prepping for the devourer final quest, so there's an extra 4 (5 if you count Sir Lora) NPC the switch has to deal with. I'll try dismissing Sir Lora to try and free up some space and see if that changes anything.
If it changes anything, I am specifically playing on a Nintendo Switch Lite and not the original one.
