i deleted it, so I cannot now check, but I don't recall seeing a 4 . pretty sure calibre saw it as azw3, & T = edit book displayed it as that
I do not have KindleUnplack plugin, unless that is there by default
that print replica definition was on a general help page, not a link from book details.
if you have an azw4 to test with, does it open in calibre book editor , and display with html, CSS etc components like any other azw ?
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