Particle Cutout Will Clip Texture On Certain Frames Even With Alpha Threshold of 0.0001

A licensee has reported that the particle cutout feature will sometimes clip the image on some frames despite having an alpha threshold of 0.0001

The attached project has an example of this on the specified frames (5,8,9,11). The clipping may be a little hard to spot if you don't know where to look. Also, the amount of clipping may vary or depend on the texture used.

1. Open attached project
2. Open the particle system in cascade and select the SubImage index module
3. Set the index value to any of the following (5,8,9,11)

RESULT
The sub image index frame selected will display in the scene and you can visibly see some clipping along parts of the left side of the image.

EXPECTED
The correct frame displays and no clipping occurs.