Unable to add Regular Roles to users

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.1.X, Master
• Fix Version/s: 7.0.0 DXP FP84, 7.0.10.12 DXP SP12, 7.0.X, 7.1.10 DXP FP9, 7.1.10.2 SP2, 7.1.3 CE GA4, 7.1.X, Master
• Component/s: User Management > Roles, User Management > Users & Organizations
• Labels:
  • QA-AUTOMATION
  • ee-ts
  • liferay-dxp-71-sp2
  • liferay-fixpack-de-84-7010
  • liferay-fixpack-dxp-9-7110
• Branch Version/s:
  7.1.x, 7.0.x
• Backported to Branch:
  Committed
• Story Points: 0.25
• Fix Priority: 5
• Sprint: U&SM | S02 Sprint 12
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/68085
• QA Test Name:
  • LocalFile.LocalizationWithSites#LocalizeCountryName
  • LocalFile.SitetemplatesUsecase#SitesDynamicTemplateInheritance
  • LocalFile.UsergroupsUsecase#ViewUserGroupPermissionsNoAsUser
  • LocalFile.WebContentWithPermissions#AddAndViewStructureAndTemplateWithPermissions
  • LocalFile.WidgetPagesUseCase#SitesPrivatePagesPermissions
• QA Test Score: 21

Steps to reproduce:

1. Navigate to Control Panel > Users > Users and Organizations
2. Enter the edit screen for any user
3. Navigate to Roles
4. Select/Choose a Regular Role (e.g. Administrator) and click Save on the user form.

Expected results:
A success alert pops up and the role is added to the list of assigned Regular Roles.

Actual results:
A success alert pops up, but the role is not added to the list of assigned Regular Roles.

Note:
This issue does not happen for Organization Roles or Site Roles

Reproduced on:
Portal master Git SHA: d10fb1c1723c1aa17afb0e6eb859f1dba3f72c51