Only an admin user #1 (drupal) is able to edit an export mapping or edit one
Drupal 7, civicrm 5.33.1 (but also on 5.29)
My user#1 user can edit a mapping when exporting fields of a searched group of users, and it can also create a new mapping, just editing an existing one.
But when other manager user, with permissions to export, is trying to do it, system freezes and nothing happens, and there is no a new or modified mapping on civicrm mappings section. So the process is stuck.
This user can export contact fields info without problem.