Steps to reproduce the issue

Set Cassiopeia template as default.
Add file user.css to /media/templates/site/cassiopeia/css
Add new class to the file:

.testclass {
	background: yellow;
} 

Add a menu link of type Users > User Profile.

Open Users > Field Groups: Add a group
Open Users > Fields

1. Add a field of type text and assign it to the group created before.
2. Switch to tab "Options". In section "Display Options" add CSS class "testclass" into the field "Display Class".
3. In fields "Prefix" and "Suffix" add any value.
4. Save and close.
5. Edit the profile of a registered user. Add any value into the custom field ceated before.
6. Save and close.

Login in Frontend as registered user. Click menu link to show User Profile.

Expected result

The field container of the User Custom Field having a yellow background.
Value stored in field Prefix to be shown before value of user custom field.
Value stored in field Suffix to be shown after value of user custom field.

Actual result

The field container of the User Custom Field has no yellow background because CSS class "testclass" is not beeing applied to the container.

Values set in Prefix and Suffix are not shown.

System information (as much as possible)

J5.0.3
PHP 8.3.3
Cassiopeia template

Additional comments

The same issue regarding CSS classes goes as well for following fields in section "Display Options":

• Value Class
• Label Class

The issue regarding CSS classes, Prefix and Suffix does not apply to Custom Fields of type com_content. It's working there.