I apologize, here is an edit for an earlier typo in my post
I have tried creating a playground and just creating the Mutable Metadata item WITH the same errors
My work around for the time being has been using extraAttributes field instead, but after setting this metadataItem with the extraAttributes field populated to AVAssetExportSession.metadata = metaDataItem and regenerating a AVMutableMovie(url: assetExportSeshLocation) the resulting AVMutableMovie has an empty metadata field
AtelierMila
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