Remove 2D/3D collider doesn't work when using ReguireComponent

2) How can we reproduce it using the example you attached
1 Create new project
2 Create empty object
3 Create script A that requires BoxCollider
4 Add A to cube
5 Add BoxCollider to cube from UI, in poped-up window press Replace - notice BoxCollider is not removed - added 2 BoxColliders (no any messages)

Same for 2D colliders.
Reproduced only for same colliders.