I believe they MUST contain any aligned DKIM signature regardless of validity 
and SHOULD  contain an entry for each domain, selector, result triple.

RFC 7489 says:

   The report SHOULD include the following data:

   o  The DMARC policy discovered and applied, if any

   o  The selected message disposition

   o  The identifier evaluated by SPF and the SPF result, if any

   o  The identifier evaluated by DKIM and the DKIM result, if any

   o  For both DKIM and SPF, an indication of whether the identifier was
      in alignment

(and a bunch of other stuff)

I don't see any basis to change this, since as long as the report's format and syntax are correct, it'll interoperate. It may not have all the hints the report's recipient would like, but life is like that.

R's,
John

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