Parameter collection overrides defined in the Niagara system's System Properties do not work.

In FNiagaraSystemSimulation::GetParameterCollectionInstance the return value of GetParameterCollectionOverride is not stored, so the overrides are never used.

Steps to Reproduce
  1. Create a Niagara System based on the Fountain emitter
  2. Create a Niagara Parameter Collection
  3. Add a float parameter, and set its value to 100
  4. Link the Emitter's spawn rate to the float parameter from step 3 
  5. Create a Niagara Parameter Collection Instance 
  6. Set the Parameter Collection Instance's Collection to the collection from step 2
  7. Override the float parameter in the collection instance by checking the box next to it
  8. Expand the parameter's properties by clicking the expand arrow
  9. In the expanded field set the float's value to 0.0 and save the collection instance
  10. In the Niagara system's System Properties module add an entry to Parameter Collection Overrides
  11. Set the override to the collection instance from step 5
  12. Save and compile the system


The emitter still spawns particles, even though it should have a spawn rate of 0.0

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ComponentUE - Niagara
Affects Versions4.255.05.1
Target Fix5.2
Fix Commit23587611
Main Commit23587611
CreatedAug 20, 2020
ResolvedJan 5, 2023
UpdatedFeb 4, 2023
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