On screen, a placed document is drawn from a bitmap made in the
background, and that bitmap was rendered with the default options. An
image inside the placed file whose pixels cannot be decoded therefore
drew nothing in the bitmap, even though the canvas marks such images
with a crossed box. The bitmap now follows the frame's
mark_undecoded_images setting, the bitmap cache keys on it, and a
bitmap standing in for one still being made has the same setting.
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