Should an incorrect ISBN found in the resource still be recorded

Yes! Somebody else with the resource in hand might use that incorrect ISBN to search for your record, so it’s best for access if the number is in there.

To back that up with a rule, RDA on Incorrect identifiers says “If an identifier is known to be incorrectly represented in the resource, record the number as it appears. Indicate that the number is incorrect,
cancelled, or invalid, as appropriate.“

In MARC, we indicate this by putting the incorrect ISBN in 020 ǂz. If the ISBN is not for the resource you’re cataloging, but rather for a related resource, you can indicate that too in a ǂq:

020 __ ‡z 9781410440921 ‡q (large print)

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