On Wayland, copy/paste from native app (gnome-terminal) to X11 app (emacs) only copies first part of text

At least on Fedora 27 GNOME/Wayland (with mutter-3.26.2-2.fc27.x86_64), copying a large amount of text from e.g. gnome-terminal and pasting it into e.g. emacs (or firefox) only copies the first part (stopping slightly short of 64K), while pasting into e.g. gedit works fine.