I’m in the same boat. I cloned my account to the Switch years ago, and that apparently was a one-time-console merge which I find baffling, given it wasn’t described that way at the time.
I haven’t touched my Switch account in years as my PC is my main account, and I did the merge today with my PC, Switch and PlayStation accounts and all the data on the other accounts was lost and not transferred.
Very cringe that I lost the chance to merge my PlayStation account because of this :((