Just lending my voice to this issue: Unreal Engine Issues and Bug Tracker (UE-81308)
We recently updated our project to 4.23 and everything crashes. Specifically, as with issue UE-81308, trying to open, or edit blueprint variables with nested structs, maps and sets causes the editor to crash with an “Unhandled exception UE4Editor_PropertyEditor”
I have also been able to reproduce the bug in an empty project through a variety of setups. Let me know if anyone needs details on it.
Hoping this gets fixed soon. Our game makes extensive use of maps and structs in blueprints and currently we cannot use 4.23 due to this editor bug. Worth noting, we can play our game in 4.23 and it looks great thanks to the new lighting improvements! We just can edit a lot of BPs.