Comment 8 for bug 1726439

I can't recall gnome-terminal changing anything hereabouts.

I'd still say that if you mix the two copy-pasting methods, it's pretty much a coincidence if it works in some cases. I'm sure it still doesn't work everywhere (if it worked everywhere, there would probably be only a single copy-paste buffer and we'd all be much happier). And as long as it's (unfortunately) not indended to work, and doesn't work at plenty of places, having even one more place where it doesn't work is IMO unfortunately not a bug.

The bug (a truly serious, much higher level design bug which Linux/Unix desktop developers couldn't fix for decades now) is the existence of two separate copy-paste buffers.