XYcopy.exe: Cloned "Not responding" window under Win10, in special circumstances

[Borut]

Hi! During at least several last months (perhaps half a year, or more), when I do background copy of large files to slow (USB) devices, I have noticed that Windows (10) creates a "virtual" clone of the XYcopy.exe application window (adding "Not responding" to the title). This cloned window overlaps the original one, but is a few pixels smaller. Now, this is the usual way Windows responds to (sometimes not optimally programmed) applications, when they really do not respond. However, these both windows seem to respond quite well all the time. The only difference seems to be in the title, where the "percentage done" in one of them seems to be frozen (perhaps by Windows!). I am attaching a screen shot, where I have positioned these two windows side by side. I am wondering if this is normal and is to be expected, or it is perhaps something specific to my place, or it could perhaps somehow be avoided? (I positioned this report into bugs section just to get a more prominent place, sorry, but I do not actually expect that it is a bug. Just reposition it where more appropriate.)

[admin]

Windows (10) creates a "virtual" clone... first time I hear about this. Can't contribute anything useful, I'm afraid.