The Exact reason why it does this is becuase the treadbreaker is considerd like a new weapon so it resets to fire the new weapon. As in vcoh when you upgrade a sqaud for the weapons they switch out the old ones and grab the new ones. same with 88 artillery it does the same, the crew gets off, the new weapon sets. then they fire.
Yea, Leo Went over this with me when i first used the pak36 but that is a better reason to explane the main problome of TreadBreaker being useless.
oh yea i allso think they decloac in the prosses but i havent used them in ages so.