On mouse hovering on "Start Position", tooltip always appear on the center of the Terrain Toolbox window, Refer to the attached video

Steps to repro:
1. Create a new project
2. Windows > Package Manager > TerrainTools > Install
3. Window > Terrain > Terrain Toolbox menu option
4. Terrain Toolbox Window > Create New Terrain > Hover mouse on Start Position

Actual result: Tooltip of "Start Position" always appear at the center of the Terrain toolbox window

Expected result: Tooltip of "Start Position" should appear near the hovered property

Occurring on:
2021.1.0a3, 2020.2.0b10, 2020.1.2f1, 2019.3.14f1 with Package Version 3.0.1, 3.0.0 , 2.0.2, 1.1.2-preview,

Environment: Windows 10 & Mac 10.15.