Can no longer watch prime from up next without being charged

I have had Amazon Prime membership since before Prime Video existed. I’m now on my 2nd Apple TV and until now there has not been a problem watching Prime. E .g. We have watched all the included episodes of NCIS without issue. House is the first series that we have started watching since the TVOS 18.0 upgrade. We watched the first episode by going into the Prime app and searching for it. After watching it we went back into the TV app and checked that episode 2 appeared in Up Next. When went to view the next episode the TV app wanted to charge us for watching it so we had to quit that and go into the Prime app and search for it again. I have tried deleting it from Up Next and then starting it from Prime but it still wants to charge us when we run it from Up Next. I have also tried deleting all the running apps before starting it off from Prime but we still get the charge coming up when we run it from Up Next.