If you click "Configure Realm" and then click a world before they are loaded, the game crashes.
How to reproduce: Own a realm and click "Configure Realm" and before the worlds are loaded, attempt to click on a world, and then: ❌ The game crashes.
If you click "Configure Realm" and then click a world before they are loaded, the game crashes.
How to reproduce: Own a realm and click "Configure Realm" and before the worlds are loaded, attempt to click on a world, and then: ❌ The game crashes.
There was a fix in Minecraft 1.15.1 that supposedly solved this or a similar issue. Is this still a problem for you?