Tooltip is missing for "Root Bone" and "Bone" Properties in Sprite Skin component, Refer to the attached video

Steps to repro:
1. Create a new project
2. Windows > Package Manager > 2D Animation > Install
3. Hierarchy > right-click > Create Empty
4. Inspector > Add Component > 2D Animation > Sprite Skin > Add
5. Hover mouse on "Root Bone" and "Bone" Properties

Actual Result:
Tooltip is missing for"Root Bone" and "Bone" Properties in Sprite Skin component

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

Occurring on:
2021.1.0a1, 2020.2.0b8 with Package Version 5.0.2
2020.1.8f1 with Package Version 4.2.6, 4.2.5
2019.3.16f1 with Package Version 3.2.3, 3.2.2

Environment:
Windows10 and macOS 10.14