Material Parameter Collections must be reassigned to access new parameters

To access newly created parameters in a Material Parameter Collection via the Set Scalar Parameter Value or Set Vector Parameter Value nodes, you must reassign the Collection to the node.

Also Reproduced in Main Promotable-CL-2487422

1. Open QAGame Editor
2. Create a New Material Parameter Collection with one Scalar and one Vector Parameter
3. In the Level Blueprint, off of Event Begin Play add a Set Scalar Parameter Value and Set Vector Parameter node
4. Add the Collection created earlier
5. Back in the MPC, add another 3 to 4 Scalar and Vector Parameters
6. Save the MPC
7. In the Level Blueprint, Compile

RESULTS: You will only have access to the originally created Parameters in the node drop-down until you reassign the MPC in the Collection input

EXPECTED: When you re-Compile the Level Blueprint, I would expect that the BP would update information from the MPC automatically.

The pop-up menu for material collections in Blueprint doesn't display all entries