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I opened the test file in the calibre Editor and was not able to see black diamonds in Preview. They were also invisible in Code View but it doesn't mean they aren't there.
Using the first occurrence shown in image 1 in post #1:
- select the dl of what looks like madlike in the first paragraph and press Ctrl F to do a search.
- carefully remove the d and the l which leaves just the middle single "invisible" unknown char in the Find box
- enter an mdash in the Replace box and do a Replace All. 7 occurrences were replaced in the test epub.
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