On Hersfield there is a Patrician Filch spawn with 3 robots north-west of the station.
- sometimes they SPAWN inside a building
- sometimes if you try to get closer their optimal they try to retreat and walk into the building
- sometimes if someone walks outside this area and they follow him they get stuck when moving back to their spawn
It's easy to reproduce (the "stuck while trying to hold optimal" and "stuck while move back") if you like to check why/how/when.
PS:
It might be, that the fundament of the building isn't totaly set as "unpasseble" like
...#####
##........##
##.....X.##
...B####
The drone retreats after following someone to the X as it is "close enough to spawn" but then is stuck inside the building.
This would explain the "stuck on spawn" too as the spawn area might be to close to the building.
And the B might be the point, where the drones enter the building when trying to hold distance as there is a tiny tiny hole where they can pass. (I allready tryed to enter the building but my Arbalast seams to be to big).
changing it to
..######
########
########
..######
should solve the problem