I was watching a video from two years ago about different social norms and this showed up. Found someone questioning the same eight years ago on reddit (when it seemed less normalized). It feels so weird not being aware of this shift, even as a foreigner.
I’m exactly the same. I also used to use a generic “have a good one” because I didn’t know what time it was during my evening shift. I did have a person make a minor scene once, saying he hated when people said that because he didn’t know what “one” was in reference to, though.