Thank you so much for the additional details! I’ll make sure the team gets them.
I think that for Inkscape the result may also be dependent on settings governing the interaction between the program and the OS. I know that on the Mac (because inkscape runs under a copy of the X window manager instead of directly under Mac OS) there is an Inkscape (well, X, sorta) copy buffer and a MacOs copy buffer, and a bunch of buttons you can push to determine the how or whether information is passed from one to the other, with most of the results being stupid. E.g. a lot of times the OS helpfuly converts to a bitmap before pasting.