Can't reproduce the crash on copy. I can reproduce the missing objects in the pdf. Removing all masks from the drawing (Ctrl+A, Ctrl+Shift+U until there are no more groups, then Ctrl+A, then Object > Mask > Release) fixes the problem.
I gather you imported this from a pdf?
Whenever you can, try to avoid roundtrips via pdf.
Can't reproduce the crash on copy. I can reproduce the missing objects in the pdf. Removing all masks from the drawing (Ctrl+A, Ctrl+Shift+U until there are no more groups, then Ctrl+A, then Object > Mask > Release) fixes the problem.
I gather you imported this from a pdf?
Whenever you can, try to avoid roundtrips via pdf.