When a prefab of Mirror 3D object is created and Blend Distance property from the "Planer Reflection Probes" component is dragged beyond limit cause mouse cursor to stay in Busy state always.

Steps to repro:
1. Create a new project with HDRP Template
2. Hierarchy >right-click > 3D Object > Mirror
3. Create a Prefab Plane (Mirror)
4. Project > Plane (Prefab) > Select
5. Inspector > Planar Reflection Probe > Blend Distance > Change Value using mouse drag.

Actual Result:
Mouse cursor always stays in Busy state when the input value of Blend Distance property

Expected Result:
Mouse cursor should be in a normal state even if the input value of the blend distance is dragged beyond the limit.

Reproducible in:
2020.1.0a20, 2020.1.0a15

Working Fine in:
2020.1.0a14, 2019.3.0f6

Environment:
Occurs only on Windows 10.