https://bugs.winehq.org/show_bug.cgi?id=43603
--- Comment #3 from Alexandre Julliard julliard@winehq.org --- Created attachment 59022 --> https://bugs.winehq.org/attachment.cgi?id=59022 Try other clipboard formats on failure
That's a Spectacle (or Qt) bug, it claims to export PIXMAP but sets it to the bitmap bits instead of Pixmap ids as specified in ICCCM.