Another obscure glitch with blocking and unblocking.

To make the glitch occur, go to a community, then go to one of its posts, and go to the same community again from the link on that post. If you block or unblock that community and then press the Back button at the top left twice, the original community screen you started on won't reflect the new blocked/unblocked status.

I put a GIF illustrating the menu saying "Block" rather than "Unblock", but testing indicated that the reverse case can also make the menu say "Unblock" rather than "Block".