I think it did work.
I just dragged in Mojave 10 rows of text to Desktop and size of textclipping is 21KB.
I then dragged same 10 rows and included 1 picture, now size is 6.4MB.
[doublepost=1540437524][/doublepost]I just dragged that 6.4MB textclipping to empty TextEdit window and both 10 rows of text and 1 picture showed up.
So it works but it fails if you double click open or quicklook.