Bug : River component distortion failure without infinite ocean

Github Issue:

https://github.com/aws/lumberyard/issues/412

Describe the bug:

River component with Physics enable when Level not contained infinite ocean,Does not take distortion effect,and property speed failure

Steps to reproduce:
Create new level without infinite ocean, create new entity, add a river component and spline component, enable river physics, does not take distortion effect

Expected behavior:
River component show distortion effect with Physics enable when Level not contained infinite ocean.

Screenshots/Logs:
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Lumberyard version
v1.19.0.0 - Build 918128