Form Builder :- User Specific Rights not working for some fields like Middle name on Page Field Configuration screen

Steps:-
1] Log into the system using valid credentials.
2] Search and select company
3] Click on Form Builder option from Benadmin section
4] Click on Demographics form
5] Click on Page Field Configuration tab.
6] Set User Specific rights as View Only for middle name field and click on save button
7] Now log into the system with admin login for which the user specific rights have been set
8] Search and select any employee and visit his demographics page

Actual Result:-
Middle Name field is editable

Expected Result:-
As per the page field configuration settings this field should be View only