Skype Room Systems reveal sensitive Private meeting subject

When you include a Skype Room Systems v2 into a Skype meeting and set the meeting to Private, the SRS device shows the meeting just as expected with Private Meeting, as expected by the person booking the meeting since they might have sensitive information in the meeting subject:

 

But, any visitor in the conference room (often in more public/unsecured locations) can press Join and this reveals the subject line of the meeting. Not necessarily with meaning but by mistake.

 

This can't be right? The subject line of a private meeting might be sensitive and therefore marked as private.

 

Get-CalendarProcessing <mailbox> shows the below and RemovePrivateProperty is already set to $false. I suspect the subject line is taken from the Skype for Business meeting rather than the actual mailbox and that's why it's shown?

 

AutomateProcessing : AutoAccept
AllowConflicts : False
BookingWindowInDays : 365
MaximumDurationInMinutes : 2880
AllowRecurringMeetings : True
EnforceSchedulingHorizon : False
ScheduleOnlyDuringWorkHours : False
ConflictPercentageAllowed : 0
MaximumConflictInstances : 0
ForwardRequestsToDelegates : True
DeleteAttachments : True
DeleteComments : False
RemovePrivateProperty : False
DeleteSubject : False
AddOrganizerToSubject : False
DeleteNonCalendarItems : True
TentativePendingApproval : True
EnableResponseDetails : True
OrganizerInfo : True
AllRequestOutOfPolicy : False
BookInPolicy : {}
AllBookInPolicy : True
RequestInPolicy : {}
AllRequestInPolicy : False
AddAdditionalResponse : True
AdditionalResponse : This is a Skype Meeting room!
RemoveOldMeetingMessages : True
AddNewRequestsTentatively : True
ProcessExternalMeetingMessages : False
RemoveForwardedMeetingNotifications : False
IsValid : True
ObjectState : Changed