Make sure index defnition is updated with orderby for both the properties. More details refer https://docs.adobe.com/ddc/en/gems/oak-lucene-indexes.htmlslide 14 has sample index defnition for order by.Two @ is not valid (@contactinfo/@LASTNAME_STRIP) just use contactinfo/@LASTNAME_STRIPInstall the latest service packAbove changes will work if not file an official support request by attachingPackage with index defnitionDebug output of [A] . https://docs.adobe.com/docs/en/aem/6-0/deploy/upgrade/qu...

Find sha checksum of the asset & then in s3 bucket check for the same.Ex:- Asset sample.jpg might have SHA1 checksum as 1607c40f262bc85061703568954d325416c08716 then in s3 bucket check the file stored at/16/07/c4/1607c40f262bc85061703568954d325416c08716

Error indicates an permission issue as well as multiple threads trying to commit & descriptions says some times & some images. I would suspect onDispatcher or webserver level config settings of 412 Status code.Making double requests. Might be facing issue for already activates images with external listeners.Repository is not in consistent state due to indexing issue etc...Steps would be simplify the caseDo you see the issue by hitting aem instance directly without any layers like webserver, disp...