Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1327670
Description of problem:
While updating own name/surname, the new string gets displayed in the main menu even when it's invalid (e.g. too long) (see screenshot).
This is not permanent as the form can't be successfully submitted and disappears as soon as user get the name right or cancels the form.

Version-Release number of selected component (if applicable):
6.2.0 snap 8.1

How reproducible:
always

Steps to Reproduce:
1. navigate to My Profile > Edit User
2. update first name/surname to some invalid string
3. hit submit

Actual results:
the name updates in the main menu even if it's not valid

Expected results:
no change is done until form successfully submits the valid data

Additional info: