Units can move over pre-placed aircraft on the ground

[michaeldgg2]

Issue Summary

Aircraft, which are pre-placed in the editor, can be run over other units.

Reproduction

Place aircraft in editor, play the map and try moving any unit on the cell with the aircraft.

Expected behavior

Units should not move over aircraft, when it's on the ground.

Screenshots / Screen recordings / Replays

At the time of writing, it's reproducible on current bleed.

[PunkPun]

the solution might want to address #21305 as well