API-created user and Project Role issues

[Tim_Neyman]

We're building some automation for one of our Jira instances and we're creating new users via the Jira API. (currently v 7.12.3) I can successfully create the new user with no problems. The new user shows up in the User management screen and all looks good. I can manually assign the newly created user to a project role with no problem via the project Users and roles Add users to a role functionality. The problem is when I add a user to a project role using the Jira API. The API add appears to work fine, as I can see the new user in the proper project role on the Project Settings - Users and Roles page. However, a user added to the project role via the API cannot be deleted from the project role via the UI (by clicking the 'Remove user from role' trashcan) or by removing them using the API. Any help would be appreciated!