I suggest you use either mlvfs, cr2hdr-r, mlrawviewer if you,re on mac or raw2cdng if you,re on windows. At least mlvfs, cr2hdr-r and raw2cdng(windows) will embed audio automatically in Davinci resolve. Not sure how mlrawviewer is handling this but should work.
Mlvmystic from what I understand don,t include the metadata needed in the wav and dng files.
Update* saw you,re on mac. You should be all set.