Minecraft Username:
GeekGuy432

Brief Description:
VMR rare keys cannot be used in /cc.

Instructions:
1. Do /kit rare to receive keys.
2. Hold the keys in your hand.
3. Do /cc
4. Left-click the chest.
5. A message appears in chat (see screenshot)

How many times did you recreate this?:
About 10 times. I've tried moving from VMR to main an back and trying again too to see if that fixed it.
Result:
"[ECC Crates]: You need a key to open that Crate."
No keys are used up when you click the chest.
No unobtainable item is received.
Expected Result:
One key is used and you receive an unobtainable item.
Evidence:

 

It's fixed for me too.