Weird and wonderful. As far as I know, no version of the Kindle Paperwhite firmware supports rendering epub files.
Just tested on my Paperwhite 4 with 5.16.2.1 and it does not accept an epub as a valid document.
If you were using calibre, it would convert an epub on the fly when sending it to a Kindle but you seem to be saying that it works with copy/paste.
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