The bug or something I'm not understanding is this:
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Create a new background and forground for a whole page. So start with
FXXXBXCX and then close withbf at bottom of page. -
Internal to this background and forground environment, introduce a bold or italicised environment.
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The bold or italicised environment will also create a new line behavior, where all the characters after it will be forced to render on a new line.
Removing the background and for ground environment will remove this new line behavior, and italicised or bold will work as expected.