Steps to reproduce:
1) open users attached "New Unity Project 2.zip (3 MB)"
2) play the scene
note: Green box is of size = 1 and casts a BoxCast to negative x axis upon collision it turns red
3) drag the object towards positive X axis

Expected: Collision stays consistent throughout the BoxCast
Actual: Polygon gap exist only underneath the box

Reproducible: 5.2.4f1, 5.3.2p2, 5.4.0b4
Not reproducible: 5.0.4f1, 5.1.3p3