NiPlanarCollider sometimes deflects particles that move away from it

Issue Description

Steps to Reproduce

System Information

• OpenMW Version:
• Operating System & Version:
• GPU:
• Morrowind Version:
• Language:
• Addons:

Mods

• Are you using mods? Yes/No
• Are you using any shader mods? Yes/No
• Does it happen in a clean vanilla install? Yes/No/Untested

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