In the editor:
1. Place player unit and AI, call it e.g. joe
2. In initline of joe type removeAllWeapons joe;
3. Start the mission
4. Run some meters away from joe, then type in debug-console:
joe setSpeedmode "FULL"; joe domove getpos player;
--> If the bug is there, joe won't sprint, but only jog (even though before the introduction of this bug, he sprinted - regardless if unarmed or armed).