Unable to edit colliders when its preset is created, the Edit Collider button is missing in the Preset of colliders.

Steps to repro:
1. Create a new Project.
2. Hierarchy > right-click > 3D Object > Cube.
3. Click on the preset icon of the Box Collider component.
4. Save current too > save.
5. Select Created Preset(BoxCollider) from Project Window.

Actual Result:
Edit Collider button is missing in the Preset of colliders in the inspector window.

Expected Result:
Edit Collider button for preset appears in the inspector.

Reproducible in:
2020.1.0a7, 2019.3.0b5, 2019.3.0a8.

Working Fine in:
2019.3.0a7.

Environment:
Windows10 & Mac 10.14.