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The location, in the deleted emails folder would likely cause the move to chest to fail. email folders are a trick, it isn’t a folder at all, but a database file. It stores many emails inside it so it is difficult and often impossible to just extract an infected email from the file without corrupting the database file, possibly losing other emails in that file/email folder.

This on occasion results in the only option deletion of the database file with the loss of all email in that folder. So it is important not to use your inbox for general email storage as the inbox is often the one infected or open at a crash, etc. causing its coruption and loss of emails.