About once an hour with 60 trucks, one of them will randomly somehow make it's way into a completely enclosed area.
The belts in this picture have not been modified or touched for hours, but somehow this truck just showed up there. It's close, but not within range, of a warehouse it could have tried to make a delivery to. But the warehouse is on the other side of 2 assemblers. I'm not sure why it was there, nor how it got through the belt.

Stuck truck.save
(side note: this log file may not be up to date - it's last_modified timestamp is about 15 minutes before this issue happened. But here it is anyway)
22-06-03_12-19-09_7926.log
Files not imported: Stuck truck.save


