Washed out preview images after upgrading to 2021.2.0f1

After upgrading from 2020.3.21 it looks like every image, every image format, in my project is washed out (de-saturated?) in some contexts in the Editor only. Screenshot to show this:



The image is as expected in the Sprite Editor, Preview in the Inspector panel, icon at the bottom of the project panel.

It's washed out in the icon at the top of the inspector panel and top right in the project panel.

I've tried reproducing this in a new project without success even after importing all the same plugins that look like they might be doing ... something (Bakery (ftTextureProcessor), Spine, ProBuilder are all listed as Asset PostProcessors, I'm also using Sprite Assist). Any suggestion on how to get this back to working as expected?