As the title says, setting off an env_explosion next to an emp_eng_map_brush crashes the game. I have attached a vmf of a setup that will crash the game.
Not sure if it's related to this issue, but I've had crashes on my maps if the explosion force of the env_explosions are too large. In general, maps in source doesn't like things related to physics in multiplayer.
It's probably related, env_explosions don't set the empires specific damage type which is expected to be set.