In the tasks appear all the technicians and all the groups in the combo box assign a task, this is a bug?

I noticed a strange behavior in assigning tasks that appears to be a bug.

In the combo box to select user or group that will perform the task appear all the technicians. And on the next button to check the availability is visible only the users that assign the ticket or users no the group that is assigned (this seems to be the correct one)

This bug been reported? Does any new version to fix it? I'm here with GLPI 9.1.4.