Starting from the beta of android TV 10.19. I have pinned my own libraries and another libraries shared to me. Every time I watch a TV show and finish a TV episode and go back to plex home screen, the continue watching row would remove everything from my own library. I would have to refresh the continue watching row (going into pinned library and back) to see my own content back on continue watching row.
Now with the latest stable release, the same thing happens, but when I go to another pinned library and back into plex home screen, my content appears but with no poster image.
Pre 10.19 versions worked well. Only from 10.19.x onwards this happens.
So this is from the setup when first installing plex on your android TV device. The first server you choose on setup is the one that disappears from continue watching row if you pinned libraries from multiple servers.