Opening Realms menu in a snapshot version for the first time displays Realms screen temporarily

The bug

When opening the Minecraft Realms page for the first time after opening Minecraft in a snapshot version, a "Back" button in the corner will appear for a second. This is part of the Realms UI for a release version.

Soon after this screen is visible, the user will be taken to another screen, informing them that their version is incompatible with Realms.

How to reproduce

1. Open Minecraft in the latest snapshot
2. Select "Minecraft Realms"
   Back button is temporarily visible