On assigning Post-processing Data to None, the Post-processing Enabled checkbox gets unchecked automatically in the Inspector when 2D Renderer is selected in the Project window, Also selecting PostProcessData from the Assets selector window doesn't enable the Post-processing, Refer to the attached video.

Note: Enable checkbox manually for reassigning the PostProcessData

Steps to repro:
1. Create a new Project with URP Template
2. Project > Create > Rendering > Universal Render Pipeline > 2D Renderer
3. Inspector > Post-procesing > Data > None

Actual Result:
Post-processing enable checkbox gets unchecked automatically on selecting PostProcessData to none and doesn't get enable on selecting PostProcessData again from the asset selector window

Expected Result:
Post-processing gets enabled on selecting PostProcesData from the asset selector window

Note: Post-processing dropdown menu is introduced in package version URP 11.0.0 and Unity 2021.1.0a10

Reproducible on:
2021.2.0a2, 2021.1.0b3, 2021.1.0a10 with pacakge version 11.0.0

Environment:
Windows 10, macOS 10.15