Are we sure it's the British Telly community? Unless OP manually revealed that post, then the two hidden ones above may be something else.

Regardless, they can click to reveal it as a workaround, and I still think it's just improperly handling communities marked as hidden since this is the code that seems to be triggered:

https://codeberg.org/tesseract-ui/Tesseract/src/commit/38f215e3ea164efce24cf3bf2d7f4f9ecde99633/src/lib/components/lemmy/post/Post.svelte#L352

// Community Hidden
if (post.community.hidden) {
    hidePostReason = 'Community is hidden'
    return true
}

That's fixed / no longer applicable in (upcoming) 1.5 since I re-wrote the whole filtering subsystem and no longer flag those to be filtered/hidden.