setDefaultSort indicator (arrow) not shown for nested associations

[ThomasLandauer]

Describe the bug I'm talking about the same arrow as in https://github.com/EasyCorp/EasyAdminBundle/issues/3267 When passing a nested association to setDefaultSort() this arrow is not shown - that's the reason why I was thinking that the sorting wouldn't be working at all in https://github.com/EasyCorp/EasyAdminBundle/pull/4874#issue-798007198 ;-)

To Reproduce

return $crud
    ->setDefaultSort(['city.name' => 'ASC'])
;

easycorp/easyadmin-bundle v3.5.14