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"when manually moving the epub file outside the library and opening it in ADE" -- do you mean, using Save-to-Disk?
Save-to-Disk will also update metadata in the saved copy, just like Send-to-Device. As will Send-to-Email.
As for the ORIGINAL_EPUB created by Polish Book, that is a backup file. Polish Book does a lot more than Embed Metadata, which is why it needs to create a backup.
You can disable the backup, using the option in Preferences ==> Advanced ==> Tweaks.
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