XMP unable to fully remove metadata footprint from files

In a scenario where metadata was previously written to a file with a combination of PutXMP and CloseFile, modifying the file with further PutXMP calls to remove existing pieces of metadata instead moves those "deleted" metadata entries to a separate section under `1.0/"`
Would be looking for a process to fully delete unused metadata.

Reproduce the sequence of PutXMP followed by CloseFile, then apply further PutXMP calls that remove metadata. Inspect the generated XMP packet, especially the separate section under the reported xpacket end marker, and compare it with the expected packet after deletion. Done means removed metadata no longer remains anywhere in the file.

Written by the indexing model from the issue text.