Ticket: method to switch to the correct entity

In Older versions (9.5.7 and olders), the ticket's writer (a technician of the central helpdesk with recursive rights and positioned at the "parent" entity in our case) could select a requester in the appropriate drop-down regardless of the entity membership of the requester (all users of all entities displayed in the drop-down). When the requester had muliple authorizations, it was possible to choose the entity in a second drop-down

In version 10.0.0, in the ticket's form, the ticket's writer has to first select the entity to be able to see the user in the drop-down. It was so appreciate to be able to select a user without first have to know obligatorily the entity membership.

It seems to be a regression or is it a bug ?

Thanks for your help