Getting Emitter.NumParticles on Niagara's GPU compute sim returns 0

This problem looks like the following parameters are not defined correctly. The correct parameter is Engine_Emitter_NumParticles.
Engine_Emitter_NumParticles and PREV_Engine_Emitter_NumParticles

.\Engine\Plugins\FX\Niagara\Source\NiagaraShader\Public\NiagaraShader.h

SHADER_PARAMETER(int32, Engine_Emitter_NumParticle)
SHADER_PARAMETER(int32, PREV_Engine_Emitter_NumParticle) 

Changing to the following will work correctly.

SHADER_PARAMETER(int32, Engine_Emitter_NumParticles)
SHADER_PARAMETER(int32, PREV_Engine_Emitter_NumParticles) 

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1. Create a Niagara System that Gets Engine.Emitter.NumParticles.
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   Below is a project to reproduce.
   https://udn.unrealengine.com/s/contentdocument/0694z00000QWV6RAAX
2. Check the values in the Attribute Spreadsheet.
   0 is output with GPU Compute Sim.
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   For CPU Sim it can get the correct value.
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