I have used the heavy dropsuit alongside the assault dropsuit in the same game. The light dropsuit blueprint count seems to be decreasing correctly, along with equipped gear, but the heavy dropsuit blueprint sometimes does not decrease. The equipment (heavy machine gun) blueprint decreases appropriately, but the dropsuit blueprint itself remains the same as before the match. This doesn't always occur, but 3 out of the 4 matches that I have played, deploying the heavy dropsuit 1-2 times each, I have only seen the blueprint count decrease once.

TLDR version:

-Playing 24 max player Skirmish mode
-Using default assault, custom assault, and heavy dropsuits in the same match
-heavy dropsuit blueprints sometimes don't decrease, but equipped item blueprints do