I tried refunding rocket pod on a Mi-8 and then adding it back. This resulted in a rocket pod which was listed as available, but whose rockets refused to fire.
Test scenario:
Place Mi-8 in proximity to vehicle ammo station (I used the HEDP version)
Refund all rockets
Refund the rocket pod (I used the outer right pod)
Add the rocket pod back to the pylon
Reload all rockets (I loaded the pod with HEDP rockets again)
Test fire all rockets in 16 round salvo
Current result: all pods except the pod which was replaced fire their rockets
Expected result: all pods their rockets