Only seeing posts from subscribed communities under “All”

Hey everyone, I set up a new instance yesterday and everything seems to be working except for known issues with v18.0 (postfix/email not working, image upload issues over 1mb).

However the one issue I cannot diagnose is why I can only see posts from subscribed communities when browsing “all”. Federation seems to be working fine otherwise, I’m just not seeing any content unless I am explicitly subscribed to a given community.

Is this just a federation delay for a new instance getting caught up, or is it possible I’m missing a setting somewhere? Or maybe just an issue with v18.0?

Thanks!