Tooltips are not available for following properties of the Skinned Mesh Renderer component, refer attached Video
Bounds
Mesh
Root Bone

Steps to repro:
1. Create a new project
2. Hierarchy > Create > Empty object
3. Inspector > Add Component > Skinned Mesh Renderer
4. Hover mouse properties under Skinned Mesh Renderer

Actual Result:
Tooltips are missing

Expected Result:
Tooltip appears when the mouse has hovered on the properties

Occurring on:
2020.2.0a18, 2020.1.0f1, 2019.4.0f1, 2018.4.23f1, 2017.4.40f1

Environment:
Windows10 and macOS 10.14