Bug: Unusual displacement/physics prop collision in maps

[pivotman319-owo]

Describe the bug

Physics props may sometimes clip through displacements in maps during interactions.

p2ce_2026-01-25_23-56-57.mp4

Reproduced on latest campaign system build (engine commit f0453374)

To Reproduce

1. Add a physics prop and a displacement brush (borrowing sdk_vehicles is a perfect use case)
2. Compile map and go in-game
3. Attempt to interact with the prop
4. Observe collisions breaking

Issue Map

Any map with displacements

Expected Behavior

Props should be able to collide normally with displacements rather than clipping through

Operating System

No response