No separation anxiety? 1 year old

I really like that my 1 year old does not get upset when I leave, as I don’t want him to be upset, but I worry that it means he doesn’t have an attachment with me. I’m the one who is with him the most and take care of him the most, I work very little part time and my husband works a lot. When my husband leaves, he cries. When I leave, he just goes on and plays as normal and doesn’t even notice I’m gone until I get home.

I’ve seen people say that it’s because baby knows you’ll come back, they feel safe, etc. But all the research I’ve read says that if baby cries when you leave, that means they feel the safest with you and that means they’re securely attached. So which is it? I don’t want to be seen as just a babysitter by my son.. 😔

Again, I don’t want him to be stressed out while I’m gone, it just makes me nervous that he’s not attached to me.