CapsuleCast may sometimes return invalid an 'invalid hit', where hit.distance == 0 and hit.point == (0,0,0) ¹⁾. By the documentation, this should only happen when the starting cast position already overlaps a target geometry.

Occasionally, however, CapsuleCast may return an invalid hit in certain uncommon but valid cases. For example, hitting a triangle mesh exactly edge on²⁾. Adding a small fudge value to the cast direction can alleviate this.