What do you call this?

What do you call it when there's a piece of information that you had known at one point in time and had just forgotten about it until you recently read about it or heard of it again?

I feel like it's not exactly "forgetting" the information itself but it wasn't like you remembered it specifically either, it was in your head but at like in a deep corner of your brain and it had completely been forgotten about until you heard it again and you were like "ohh yeah I did know that but I hadn't exactly remembered it consciously"

I apologise if this is not the right sub for it, I didn't know who else to ask.

https://redd.it/1wpo9vd
@r_etymology