By chance has this issue returned in 4.19.2 with latest vs2017? 15.7.6
This happened after updating my project to 4.19.2 from 4.18.3. My game packages without issue on 4.18.3 but gets crashes on map load in 4.19.2. I’ve removed the landscape and AI from the game figuring maybe something was causing the navigation generation to error. Currently I’m going through the map trying to eliminate mesh objects from the nav mesh bounds hoping I can find a needle in a haystack (bad mesh) that might be causing it.