Thanks hippo, soonix and kcott for your replies! Much clearer now.
In summary, it seems you can't rely on a flag being displayed. Curiously, on my Android 11 (circa 2020) phone, and an older Android tablet I had lying around, the flags are displayed perfectly; on my more recent Windows 11 and Ubuntu 22.04.1 no flag is displayed, just a two character country code.
See Also
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In reply to Re^5: Perl Secret Operator Emojis ($A++)
by eyepopslikeamosquito
in thread Perl Secret Operator Emojis
by eyepopslikeamosquito
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