I get the same thing. Instead of trashing a plist and a cache, I tried simply resetting my preferences. They seem to stick for awhile and then revert. I can't explain it.

Jon

macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365