Cannot delete parameters in a Niagara Parameter Collection after resetting the source Material Parameter Collection

Parameters left over from an old source MPC cannot be removed without renaming them first.

When debugging in FNiagaraParameterStore::RemoveParameter it seems that the parameter cannot be found in the parameter store when calling IndexOf.

1. Create a Material Parameter Collection
2. Add a scalar and a vector parameter to it and save it
3. Create a Niagara Parameter Collection
4. Set the NPC's source MPC to the one created it step 1
5. Save the NPC, then reset its source MPC
6. Note that the scalar and vector parameters' names have changed
7. Select one of the parameters and try to delete it by pressing the "Delete" key.

RESULT

The parameter is not deleted

WORKAROUND

Renaming the parameter allows it to be deleted 

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