<p></p>
<blockquote>
<p>The snowman code point is followed by a variant selector code point that says make the preceding character a different style, in the case of the snowman it makes it coloured. Your "split" puts another code point between the snowman and the variant selector so it applies to this code point and no longer applies to the snowman, and so the olde black and white glyph is used.</p>
</blockquote>
<p>That's how I understand it, yes.</p>

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