Storage device update

Im just curious if theres been an update which makes it so you can't play ps5 versions of old games on the external drive because I remember playing elden ring (ps5) when it was installed on my external drive but now it's forcing me to download it onto the internal.

This is something that I think is bs about the new consoles and kind of a bit of a scam. There's no reason why you shouldn't be able to play new games on external hard drives. Actually, I don't even think I have a hard drive. Pretty sure it's an ssd.