emacs describe-char missing info on unicode thumb up char

there are these unicode symbols

ok hand sign 👌 #x1f44c

thumb up 👍 #x1f44d
thumb down 👎 #x1f44e

when calling describe-char on them, it doesn't give their names.

is this a bug? does it happen to just few chars, or perhaps all chars outside basic multilingual plane? I know that many chars outside of BMP doesn't have this problem.

Xah ∑ http://xahlee.org/

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