What is it with Portland restaurants closing so early?

So I lived in Portland first in 2012 and then moved back in 2022 and one thing I’ve never gotten used to is how early restaurants close/ everyone has dinner. My biggest complaint is seeing pop-ups posting that they’ve sold out at like 6:30. What?! I’m used to having dinner at like 8 or 9. I’m trying my best to adapt, but it just feels unnatural.