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Objects penetrate/tunnel through conveyor belt with Surface Velocity property when running custom tasks #123

@zh-xinyu

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@zh-xinyu

I am encountering a physics stability issue where objects penetrate or fall through a conveyor belt when running custom task following the instructions.

I have tried implementing the conveyor using two methods:

1. Using the omni.isaac.conveyor extension.
2. Manually adding a Surface Velocity property to a Collision Proxy (Cube).

The issue: Everything works perfectly when I press "Play" inside the Isaac Sim GUI. However, when I run my custom task script, objects on the conveyor sink into the surface, spin in place (digging in), or drop completely through the mesh.

Interestingly, if I remove the Surface Velocity property, the collision works correctly (the object rests on the surface without falling). Re-enabling Surface Velocity causes the penetration issue to reappear immediately.

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