Scripting method:
1. Open the editor
2. Put a player unit and an AI unit
3. removeAllWeapons of the AI unit
4. Type in unit setUnitPos "MIDDLE"; in the debug window
(so far, so good)
5. Now type unit setUnitPos "UP"; (if the bug is really there, it should not work)
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Commanding method:
1. Open the editor
2. Put a player unit and an AI unit
3. Make the AI unit join the player's group
4. In the mission: Command the subordinate to kneel
(so far, so good)
5. Command the unit to stand up (if the bug is really there, it should not work)