Steps to reproduce the issue

Let's assume we have a Multi Language Webseite with at least two languages.
We have a Main Menu in English and a Main Menu in German.
Each menu contains a number of menu items.
Now we want to associate each of the menu items to the corresponding menu item of the other language.
Open any menu item from the Main Menu in English.
Go to the tab «Associations».
Click the «Select» button next to the corresponding language.
Use the search field in order to find the corresponding menu item of the other language.
Click the menu item of the search result.

Expected result

The menu item should be transferred into the «Associations» dialogue.

Actual result

The menu item is NOT transferred into the «Associations» dialogue. The text «- No association -» indicates that no association has been selected.
screen shot 2021-11-06 at 10 48 44

System information (as much as possible)

Joomla 4.0.4
PHP 7.4

Additional comments

It works all right if you do NOT use the search field but select the corresponding menu item by scrolling manually.