An error occurs when trying to "replace the world" in a realm

An error occurs when trying to "replace the world" in a realm

What I expected to happen was ...:
You can "replace the world" with realms

What actually happened was ...:
An error occurs when trying to "replace the world" in a realm

Steps to Reproduce:
1. Open (Realm of 〇〇〇 (player name))

2. Open the game tab and press Replace World.

Then press confirm.

3. Select the world (whatever is inside)

4. An error occurs even though it should be possible to replace it.

5. As a result, the world cannot be replaced