How to reproduce and fix infantry that get stuck in barracks

When selecting the placeholder, for example us_platoon_rifle(which is the unit that get built inside the barracks), in the barracks and giving it a move order you can reproduce this bug.

My guess is that the infantry spawning from the placeholder inherent the speed of the placeholder in the us_platoon_rifle.fbi file.

By setting the placeholders maxVelocity to a higher or equal maxVelocity of the infantry spawning this problem can be avoided.

Sideeffects? Dunno.