I noticed something which I am note really sure if it is a bug or not.
I have some custom fields for users. Along with that, I have made first name and last name fields to be required.
As admin, when I edit another user role (eg author), when I have the first name field emptied and all other fields fulfilled and hit save, my custom fields (which are also required) although they have value, they lose their value in the form. Still the values do not get deleted from the database because ig I visit the user's page after that I can see them in the form.
This happens only when I edit anther profile. If as admin edit my profile the values are still there.
Hope to be understood. It is not a big deal for me. Just mentioning that in case there is a bug somewhere in the code for required fields.