GSpice-CRITICAL **: send_key: assertion 'scancode != 0' failed over ssh-tunnelled X display back to Wayland

I have two hosts running artful 17.10 with up-to-date packages. My "source" desktop is running Wayland, and my destination desktop is running Xorg due to nvidia card.

From my source desktop, I'm able to run virt-viewer -c qemu+ssh://remote-artful/system and connect to the remote hypervisor and vm console and type on the keyboard.

From my source desktop, I'm unable to type into the virtual machine if I run:
ssh -X remote-artful
then running virt-viewer on the remote-artful host displaying back to ssh-tunneled wayland display

If I switch my source desktop from Wayland to Xorg, I can type into the VM with the ssh -X remote-artful -> virt-viewer command.

The errors scrolling in the remote virt-viewer STDERR is:

drew@remote-artful:~$ virt-viewer

(virt-viewer:6895): GSpice-WARNING **: PulseAudio context failed Connection refused

(virt-viewer:6895): GSpice-WARNING **: pa_context_connect() failed: Connection refused

(virt-viewer:6895): vnc-keymap-WARNING **: Unknown keycode mapping '(unnamed)'.
Please report to <email address hidden>
including the following information:

  - Operating system
  - GDK build
  - X11 Server
  - xprop -root
  - xdpyinfo

(virt-viewer:6895): Gtk-WARNING **: Allocating size to SpiceDisplay 0x55be15b0c350 without calling gtk_widget_get_preferred_width/height(). How does the code know the size to allocate?

(virt-viewer:6895): GSpice-CRITICAL **: send_key: assertion 'scancode != 0' failed

(virt-viewer:6895): GSpice-CRITICAL **: send_key: assertion 'scancode != 0' failed

(virt-viewer:6895): GSpice-CRITICAL **: send_key: assertion 'scancode != 0' failed

(virt-viewer:6895): GSpice-CRITICAL **: send_key: assertion 'scancode != 0' failed

(virt-viewer:6895): GSpice-CRITICAL **: send_key: assertion 'scancode != 0' failed

(virt-viewer:6895): GSpice-CRITICAL **: send_key: assertion 'scancode != 0' failed

(virt-viewer:6895): GSpice-CRITICAL **: send_key: assertion 'scancode != 0' failed

(virt-viewer:6895): GSpice-CRITICAL **: send_key: assertion 'scancode != 0' failed

Info requested from <email address hidden> error: http://pastebin.ubuntu.com/25971653/