Similar to the report on the forums "5.2.8609.5546 remote printers dont remove them selfs after sessions endeded". If the guest machine is shutdown before the host closes the session, and the host closes the session, remote printers will still show up on the guest machine once it has booted again. Reconnecting the to the guest and then disconnecting from the same host will not remove them. They have to manually be removed on the guest. We have only tested this with access sessions on two different Windows 7 guests from an Windows 10 host.
Customer support service by UserEcho