Hi the structural metadata error still exists in this beta release. UK Deliveries cannot be exported successfully from Adobe products since the 2017 release.
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We believe you, and...what's generating that report? Can we have a source sequence (with constituent media), and (ideally) an export preset containing the settings you used? [Upload location sent privately, but your email address bounced; please reach out to me at firstname.lastname@example.org, with a valid email address.]