You cannot enter the login name when editing a content object (with an eZUser attribute) after first form submit.

to reproduce:

• Go to the create new user page on admin page or an other legacy siteaccess
• do not fill any information on the creation form.
• press "publish" button
• now there is no edit field for the login name

fix:
https://github.com/ezsystems/ezpublish-legacy/pull/1200