Quantum capsules don't grow items for CORE agents
Niantic failed to program quantum captures to continue to grow items when an agent subscribes to CORE and has more than 2000 items in inventory! They still cap out at 2000 items rather than the 2500 that should be allowed.
When you open any cap as a core agent and you are over 2000 in inventory you will see a red total showing like 2130/2000. It should show 2130/2500.