Same here. I see the text, but it’s not a button. When I search for “books”, I only get posts listed and no communities.

Update: In the community search I also get an error that says “couldnt_find_object”
Update 2: But the problem doesn’t seem to exist for this community: [email protected] So, could it be lemmy.ml specific?
Update 3: It’s weirder than that: When I follow “Communities” at the top, select “All” and click on the link of a community I haven’t subscribed, then I see the button. But when I follow the link from within this post, the button disappears. The URLs in both cases are the same. Is there may be some referral logic that doesn’t work well with links?
Update 4: Here is a reproduction:

Update 5: The problem doesn’t seem to be limited to “outside” communities. I could reproduce the problem with a local community.