Community disappeared from subscriber list

A community I've been subscribed to and commented to stopped showing up in my communities list in the last few days. When visiting the community, I don't see a Join button but at the same time when I attempt to draft a post for it, it doesn't come up in the dropdown menu. This is a community with open posting, and I'm not having this problem with other communities. Is this a bug?

Edited to Add: I've heard back from the community mod and they assure me I was not banned, and also don't know why this would have happened.