The foundry loot cap is a myth, its actually an exp cap. The exp cap is hit quicker atm due to the fact that there is 2xp going on.
You should never see Crystalline Entity drop MK 12 anything. Mk 11 is as high as it goes. The only place to get MK 12 gear is kerrat, console crafting, and borg stf mission rewards.
Foundry drops are based on EXP. When you get a certain amount, drops stop. Since you gain more EXP per kill atm, your drops get halved because you reach the limit twice as fast.
Comments
You should never see Crystalline Entity drop MK 12 anything. Mk 11 is as high as it goes. The only place to get MK 12 gear is kerrat, console crafting, and borg stf mission rewards.
Again, it's because of the x2 XP event. Foundry runs on an EXP Cap and since you're getting twice as much EXP, it's speeding up the race to the cap.