Imported worlds with names including parentheses can't be edited

A world name with parentheses can’t be edited, at least if it’s more than a couple words long. I noticed this because I export worlds as backup, and import them when there’s a failure of some kind that requires me to reinstall Minecraft (such as happened with the 1.21.120 update today.)

For example, my world named ‘My Third World’ can be imported from an external export file, and it automatically gets named ‘My Third World (imported)’ after the import. I can then delete the ‘(imported)' part of the name. However, after my world named ‘My World with Portals’ gets imported, and it automatically gets named ‘My World With Portals (imported)’, nothing I try in the World Name field allows me to edit the name of the world at all.

Steps to Reproduce:

1. Create a new world and give it a name at least four words long, such as ‘My New Wonderful World’.

2. Exit the world, go into Edit, and Export the world.

3. Go back and Import the world you just exported. It will get the ‘(imported)' text added to the name.

4. Try to edit the world, and click into the World Name text field.

5. You’ll see that the caret does not originally go to the end of the text, and no matter what you do, you can’t change the text in this field.

I have not determined if this is based on the length of the world name, or maybe the number of spaces in it before it finds a parenthesis. I got tired of detective work since everything is taking longer with the servers down.

Expected Result: You can edit your world name as desired, especially to remove the unwanted ‘(imported)' tag.

Actual Result: You can only edit the world name if it’s short before the parenthetical is included.