I would invite you to read the TV guidelines. The main rule is that we follow how series are released.

Monsters: The Lyle and Erik Menendez Story was released as a new series (not a new season), as you can see on Netflix:

https://www.netflix.com/title/81287562
https://www.netflix.com/title/81665094

The TMDB entries follow the exact same structure:

https://www.themoviedb.org/tv/113988-dahmer-monster-the-jeffrey-dahmer-story
https://www.themoviedb.org/tv/225634-monsters-the-lyle-and-erik-menendez-story

By the way, we recommend checking to see if there are any content issue reports about your issue before creating a new one. You can find them via Fandom -> Discussions -> Content Issues, or by scrolling down to Discussions on the series page.