Localized selectSingle field does not get disabled with allowLanguageSynchronization = true
See attached image, the field is not disabled as supposed. It's working fine with renderType "selectMultipleSideBySide".
Expected behaviour: the field should be disabled until the editor clicks the "Custom value" button. It happens both with an item array or records from a foreign_table.
At first I wanted to use the l10n_mode=exclude setting but there is also a bug in not getting the right value, see #82843.