@BetterRed I appreciate you taking the time to help me! Allow me to answer your questions in order:
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I am using a virtual machine snapshot, so my calibre settings are all defaults, except for Preferences > Saving books to disk > uncheck Save cover separately, uncheck Save metadata in a separate OPF file, Save template: {title} - {authors}. When saving to disk, I select Save single format to disk... > AZW3. Nothing is changed when converting books, and I have no plugins. I'd be happy to screenshot something, such as Add books settings (which are defaults), if requested.
I would not normally add the exported file back to the library, making an unnecessary duplicate (or triplicate if counting the exported file and now two files in the library). I am only doing this to exam the metadata of files calibre exports (via Save to disk and Send to device). If someone said that, I would be puzzled too.
I am using Edit metadata in bulk because, in reality, I have nearly 200 files for which I want to clear all the metadata for, except Title and Author, because it is incorrect or badly typed. I am just trying to state my process accurately in my example (save the number of files). Thanks for the F2 tip!
As aforementioned, I did not plan on converting, and my Kindle does not read .EPUB. I will be redownloading all of my files as .EPUB soon. However, I found that I have the same problem when I tested on the .EPUB version of Huck Finn.
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To be clear, did you check the metadata of the exported .AZW3 file by adding it into the test library? For me, the metadata for the original book record is cleared, of course. It is the exported file that gets repopulated with the junk (Tags: Mississippi River -- Fiction, Date: 27 Feb 2020, Languages: English). Also, it matters whether I save with the .OPF file. Moving/deleting the .OPF from the same folder as the exported .AZW3 file (or using Save to disk with Save metadata in a separate OPF file unchecked) before adding it back to the library might be the difference in our results.
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