When 2 Underground belts are placed and you attempt to rotate them to flip them, it causes the game to crash.
The mod Belt Balancer 3 (unofficial 2.1 compatibility) (1.0.3) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event belt-balancer-3-unofficial-2-1::on_player_rotated_entity (ID 26)
LuaEntity doesn't contain key neighbours.
stack traceback:
[C]: in function 'index'
__belt-balancer-3-unofficial-2-1/control.lua:199: in function <belt-balancer-3-unofficial-2-1/control.lua:183>