How to move nested links in menu edition? In Drupal 8 I created nested menu links. After some days I tried  to move them. Eg. one nested link to one parent menu link but the moving got disabled.

I remember that there were small cross icons with arrows in front of each menu link that were handles to move them before. But now they are not present. How to move the links?

There is no problem on chrome but firefox.

See the picture of the problem:
If you don't have javascript error in the browser console try to click Hide row weight then you will see normal table drag behavior.