"Manage website data" on iPad never shows any data

I want to selectively view or delete cookies. The place to „manage website data“ is

Settings->Safari->Advanced>Manage Website Data.

However, when I click on that setting, I get an empty list with a spinning „wait“ wheel at the top. The system just never manages to load my iPad‘s cookies.

I‘ve reset the iPad and tried doing this with Safari running and not running. No luck.

What am I doing wrong? Thanks!

[Edited by Moderator]