On dragging the mouse cursor over the input field of "LUT Size" properties don't change its value under "Post-Processing" from URP Asset in the Inspector, Refer the attached video.

Steps to repro:
1. Create a new project with URP
2. Project window > Create > Rendering > Universal Render Pipeline > Pipeline Asset (Forward Renderer)
3. URP Asset > Inspector > Post-Processing > LUT Size
4. Change the value of LUT Size using mouse dragger

Actual Result:
Input value for the LUT Size is not changing on dragging the mouse over it

Expected Result:
Input value for the LUT Size is change using mouse dragger

Reproducible in:
2020.2.0a17, 2020.1.0b15, 2019.4.3f1, 2019.3.15f1 with Package version 9.0.0-preview.35, 8.1.0, 8.0.1, 7.4.1, 7.1.8.

Environment:
Occurring on Windows 10 & Mac 10.15