Having the same issue here - looks like only one tag gets included, and it only partially includes incoming Microblog hashtags. You'll note that if you have multiple tags and click them in your magazine description panel, you get a much wider selection than what's included in the Microblog. Pretty sure it's a bug.
Did you follow the accounts which were using that hashtag from kbin.social? That will ensure they are pulled through to the server.
No, the value is in pulling in posts with a hashtag that arent being followed yet. But it feels like that isnt really possible yet, and that someone from kbin.social has to follow the account?
Yes, I think that's how it works on Mastodon too. The server has to be following an account to get the posts containing the hashtags. No different to following an external magazine/community - you won't see the posts in "all" until somebody follows it.
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