The file-format and progress docs named three of the cases in which an
unread object's page art is not used and the file comes in as its page.
The import also does this when the object lies on an artboard that has
no page, when no page art lies inside its box, when that page art is
inside a page group with a clip, mask, transparency or appearance, when
the object holds a frame of threaded type, and when the page art uses a
pattern, image or swatch that the page lacks or that differs from the
editing data's (`replace_unread` and `copy_page_resources` in
`crates/eps/src/import/native/build.rs`).
dotCooCoo
cbd4dd5599