After applying redactions, removed images and forms were unlinked from
page-tree resource dictionaries but not from the resources of forms the
page still draws. A form sharing the page's original resource dictionary
(a common producer layout) kept the removed image reachable, so a full
save wrote it. The walk over surviving forms now drops XObject entries
for removed objects that the form's own content does not draw, and fails
closed when that cannot be determined.
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