Continuous white border around background windows in Coherence

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.

 

This happens in Mac's light mode as well.

 

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?

 

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