It behaved properly in 4.24.3.

Steps to Reproduce

1. Create NiagaraSystem, NiagaraParameterCollection, NiagaraParameterCollectionInstance.
2. Use Niagara Parameter Collection in Niagara System.
3. Specify NiagaraParameterCollectionInstance in ParameterCollectionOverrides.
4. Changing the parameter of NiagaraParameterCollectionInstance is not reflected.

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ComponentRendering - Niagara
Affects Versions4.25.1
Target Fix4.26
CreatedJun 8, 2020
UpdatedJul 17, 2020