Skype Room Systems reveal sensitive meeting subject when joining

We're running Skype Room Systems v2 and by design, when someone book a conference room with SRS and marking it as Private, the meeting is set to Private Meeting on the SRS dashboard as expected. This is important since conference rooms are often in more open/public areas and meeting subjects sometime can reveal sensitive information.

However, if any user press Join (which can be done hours prior to the meeting), either by intent or by mistake, the SRS systems opens up the meeting and reveals the meeting subject, even if the meeting is marked as Private:

This can't be right! Get-CalendarProcessing setting -RemovePrivateProperty $false so that is correct. I suspect that Exchange is all set but when SRS joins the meeting, it shows the Skype for Business Online meeting subject and there's no functionality to have this "private".

Any ideas/comments or is this something that simply has to be fixed in SRS?