Screen Aligned(Velocity) particles deform at low velocity

Screen aligned particles with very low velocity will squash in 4.23+ (No squashing in 4.22)

Confirmed in 4.25 MAIN at CL 10333042

1. Create New Cascade Emitter
2. In 'Required' Module - set Screen Alignment to PSA Velocity
3. Set Initial Velocity to ~3

Result: Particle will be squashed until velocity is increased. 

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