In a certain scenario file I have, placing units that are to board a VTOL aircraft or a chopper in custom layers (functionality of the Eden editor) causes incorrect and undefined behavior for "GETIN" waypoint types. In particular: players and/or AI may not be able to enter the aircraft; AI may flee away from the aircraft; the aircraft can take off and leave even though the "GETIN" waypoint is still active; the aircraft may not take off at all (stuck on the "GETIN" waypoint even when all crew members are in the aircraft).

This video demonstrates one possible outcome of placing units in layers.

Such a bug is particularly concerning given that it can break things in subtle ways without hinting at the cause, especially when scenarios contain the use of non-trivial scripts. In my particular case, OPFOR AI reinforcement scheduled to support a given location via a sequence of waypoints end up just stuck trying to get into the aircraft (or sitting in the aircraft and doing nothing) causing hours of script debugging only to find that the Eden layers were to blame.

N.B. I have reproduced the behavior with all custom scripts completely unloaded to be sure it's an Eden bug.