Why do Nautilus and its clones forget which files were selected after pasting them?

Files that have just been pasted are usually kept selected in Nautilus, Nemo, Caja etc., so that one can, say, Ctrl-click to deselect some of them and Ctrl-x Ctrl-v to move the others again.

However these file managers often loose track of some of the files that were pasted. They are in the target directory, but they aren’t kept selected. This bug doesn’t reproduce consistently but one pretty sure way to see it is by pasting more than 5-6 files in a big directory right after opening it, while its thumbnails are still loading. Then you may end up with only 3 or 4 of the files you pasted still selected.

Nemo is the worst in this aspect, while it’s harder to stumble on this behaviour on Caja and Nautilus. Dolphin, on the other hand, never fails.

I wanted to make a bug report about this but I don’t even know where. I started filing one on Caja’s GitHub but they require a link to the same bug in the distro’s tracker. But whose faul is it? Is it GTK’s, the individual application’s, or what?

Do you know of one file manager for Gnome that keeps selections after pasting files?