I joined one of my friend's realms back in Minecraft version 1.15.2, and have been it since the latest release, version 1.16.1. Since I've joined, when logging into the realm, the cancel button would never work. When I click cancel, I'd be sent to the screen before, but a few seconds later I would still log onto the realm. This also is broken when logging into other servers, because if you click cancel, then join a server under the "multiplayer" button, you log into both the realm and the multiplayer server. I got two outcomes from this bug, one was that the realm inventory was present in the multiplayer server, and vice versa. Another glitch was visual, and I would log in properly, but the whole multiplayer world won't render, even after reloading the chunks.