If a Lemmy user has the same name as a community, how can I tag the community on Mastodon?

I just tried to make a post on Mastodon and tag a community in it so that my post would show up in that community -- something I've done many times before.

However, in this case, there is a Lemmy user with the same name as the community, and it defaulted to tagging that user. Is there a way to tag the community specifically?

I didn't even realize that a user could have the same name as a community. I thought every fediverse actor had to have a unique at-name-at-domain handle, and both users and communities were actors.