When the 'link' between Lightroom Classic and Photoshop has issues, one of the first things to try is this:
1. Use the Adobe Creative Cloud application to uninstall both Photoshop and Lightroom Classic and when asked, keep preferences.
2. Install Photoshop first, then Lightroom Classic. The order is what is very important here.
Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"