Steps to reproduce:

1. in version zabbix-server 6.4.7
   create a new user apiuser
   assign groups to it: "No access to the frontend", "Zabbix administrators"

Result:

1. when executing the "user.login" method remotely,
   an error occurs {'jsonrpc': '2.0', 'error': \{'code': -32500, 'message': 'Application error.', 'data': 'No permissions for system access.'}

   , 'id': 1 }

Expected:

if remove the "No access to the frontend" group - no problem.
but I need to prohibit entry to the web interface.

Moreover, this works on older versions:
works in version zabbix-server 6.0.22
works in version zabbix-server 6.2.9