Continuous white border around background windows in Coherence

[albundy]

I'm getting a white border that surrounds all background VM windows in Coherence. If those windows overlap, the border surrounds all of them (not individually). See attached.

I am using the latest Parallels on Catalina with the latest Windows 10. I have both macOS and Windows backgrounds set to a dark gray (it doesn't seem to matter). Transparency effects in Windows on or off doesn't make a difference. I also have it set to color title bars and window borders, but unchecking that does not fix it.

 

[albundy]

This happens in Mac's light mode as well.

 

[albundy]

Also, if all other windows are hidden, the front window shows other Windows content between the border and the window. It just seems like the coherence border needs to be a pixel or two smaller, right?

 

[albundy]

Was hoping to find this fixed in 16, but it's not.
Front window looks great though.