Where do you see this? Because everyone else who tries those books on a Kindle Original/2/3/4 without the 3/4 updates to provide KF8 capabilities, gets a different result... furthermore, Amazon specifically designated those media queries for this exact purpose, so I am disinclined to believe they sneakily changed kindlegen to ignore them (for no good reason).
There is something wrong with your code, or there is something wrong with your method of checking, or there is something wrong with kindlegen itself.
You have said #1 is not the case.
#3 is dubious at best.
#2 is the obvious choice.
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