Yes it would seem that the extra ammo used on consecutive shots that all lasguns have is no longer being canceled out by Shock Trooper, you are getting the base ammo cost refunded but obviously recons ramp that “inefficiency cost” very quick. At least that is what seems to be going on from my limited testing.
So basically the shots are getting refunded every crit but the increased cost is not therefore ammo depletes much faster than expected with sustained fire. My main reason for thinking this is how it is working is doing short bursts has much less of a noticeable decrease in ammo which would be caused by the increased efficiency of pausing to reset the efficiency attrition.
My two-cents on the matter anyway. My guess is they will say it is working as intended like the stupid decision to make Demolition TEAM not in any way apply to the team. I guess there must be an “I” in “team” I missed.