Free Game Pass Games?

So I don't have gamepass or gold because I am a PC gamer, but I got a Xbox for Christmas and I noticed well scrolling through "Most Played Games" I can install and play some gamepass games but not all of them and I was wondering if this is a bug or a feature?

I CAN install and play Call of Duty, Forza 5, Halo Infinite (Multiplayer), Indiana Jones, Ninja Gaiden, Starfield, and Ark Survival Ascended.

Mind you these are just the ones I tested that worked.

I CAN'T install and play Dead by Daylight, Diablo 4,
Skyrim, The Hunter, Day Z, Fallout 4, Assassin's Creed Valhalla, and Farming Simulator 22.

I'm guessing Day 1 releases are bugged and available for everyone? I don't know it just seems the new and most popular games are available and the old games are not 🤷‍♀️. I'm curious if this is happening for everyone?