Just found that on the main/home screen, if you go to “Recently Added TV”, and then the “…” there is no option for “Refresh Metadata”. However, other libraries, like Movies for example, have that option there. Also, if I go into the TV Shows library and then click the “…” on the same show as I was before under Recently Added TV, I DO see the Refresh Metadata option there. I do believe this is a bug, as it is present for all other libraries shown on the home page.
Refresh Metadata is available at the episode or show level, not at the season level. So make sure that you are looking at a recently added episode or show. If it is a recently added season, the option is not there. Same thing when browsing your library. The option is there at the show or episode levels, only.
Movies don’t have a season level so it works for either the individual movie or for the entire library.