Unable to Loot Ticks

Platform: XBOX ONE
Player Count: Host, Singleplayer

Engineer perk is active, but FNIX, or Military Grade ememies will no longer drop Ticks upon being defeated.

Destroyed 15 Hunters, 2 Tanks, 2 Harvesters (Mil-Grade and above) with Engineer Perk Active - No Ticks could be looted.

I am still able to Deploy the Ticks I already had, but unable to loot new ones from enemies.

+1 Also experiencing this. Destroyed several big guys with launchers, scavenged zero tick launchers. Can confirm my engineer spec was active the whole time.