Niagara Sub UV Index ignored

Using the Particles.SubImageIndex has no effect on what portions of the a UV are rendered in Niagara.

Tested in 4.21.2 (CL - 4753647), 4.22.1 (CL - 6063286), 4.23 (CL - 6533064)

1. Download the project from the provided link:[Link Removed]
2. Change the Particles.SubImageIndex in the Set Variables category in the Particle Spawn section to a value between 0 and 7

Expected: The SubUV would change its image based on the index provided

Result: The SubUV does not change