I agree with that, of course. If someone consciously uses environmental variables, they should be aware of their impact on various Sigil functions.
A worse situation also occurs when the main language of the EPUB file itself is not on the list of codes, because then the only option is to edit the OPF file directly.
Let's leave it as it is for now, and let my post serve as a reminder for posterity that we are aware of this minor imperfection.
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