I noticed when throwing a bomb like a Molotov, Flame Trap or a Aerosol bomb from the tops of buildings the game will crash throwing you back out to the menu.
The game will also generate a crash backup save. A red error message will display in the bottom right corner, error code 1.
The specific building I had this happen on was on top of the "Mama Mcfudgeington's" building in downtown Rosewood.
The point of interest I mentioned is labeled here:
https://map.projectzomboid.com/?#0.3304595560081354,0.2816890293392594,486.176905713021
I was trying to throw a bomb down to the parking lot out back at a bunch of zombies, but what would happen instead was the game would freeze before the bomb was even thrown
as the player drew their arm back in a throwing motion. Even reloading the game and trying again would yield the same results each time. I have replicated the issue on other buildings.
This is in IWBUMS build 41.50. Using no mods.