Black screen when connecting to PC with powered off displayport monitor

If I turn off the dp monitor. I use a pc  or mac client, Teamviewer shows a black screen.
 
If I turn on the dp monitor.
Whether I use a pc or a mobile phone client, it is normal
 
The monitor and computer connected via displayport cable.
 
But in windows 10 1709,when I turn off the monitor,it is normal.
Black screen only happens in windows 10 1803 version.
I feel like a bug ?
 
PS:the client is the latest version
 
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