I have been doing this for years. Yesterday I used "edit in PS" from LR and when it opened it didn't open the one I wanted but opened about 30 or 40 other photos in that file. Thought I might have done something wrong so I tried it again with the same results. After clearing everything, restarting and a few tries nothing would even open. After another restart, I was able to open. Today I started again and got the same transfer problems. I have no idea what is causing this. I tried opening from file explorer but of course, then I get the original photo open in raw (not what I am trying to do). Please help!!! I can't work at all. I just took some great photos with a new lens and can't do a thing!!!
Please check is both Lightroom and Photoshop up to date to its latest update.
Also, Open Photoshop in the background and then do the " Edit in PS" from the Lightroom and check if that helps.