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The pathfinding on these has been...problematic for some time, but today it has broken completely; I noticed a drone doing a dance on a specific piece of rail, and when I ran over to it, more drones exited my inventory to join it, leaving me with multiple drones awaiting death by train.

Worse, removing the rail they are on causes them to immediately run to another nearby rail piece, almost as if they are seeking it out.

Seeing as these units use the vanilla pathfinder, there appears to be a game bug at hand.

I have both a GIF and a save to demonstrate:
https://i.imgur.com/iyQ9RwP.mp4

A mod is setting the drones to collide with rails,

I don't see anything broken here in the game logic

Klonan wrote: Tue Jun 09, 2020 4:07 pm A mod is setting the drones to collide with rails,

I don't see anything broken here in the game logic

After back and forth experimentation, the root cause was actually the prototype caching holding onto an old collision mask (ie water-tile) from an early version of my attempt at the water pathfinding fix (ie https://mods.factorio.com/mod/Construct ... 000c5a7f39). Turning off said caching appears to have instantly fixed it.