Document properties can be pulled from xmp metadata and doc info object.
If xmp metadata's MetadataDate is more recent than DocInfo ModDate we prioritize displaying xmp Metadata properties.

However, when specific xmp properties are not specified we expect document properties tab to fallback to doc Info properties.

This occurs for all properties except author and keywords. This is a REGRESSION as my March version of Adobe acrobat correctly fell back to using docInfo properties for author, keywords and all other properties when those xmp properties were left empty (when xmp properties were prioritized due to its more recent Metadata date)