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I get various things depending on where I paste it:

Here :slightly_smiling_face:‍↔
Terminal :slightly_smiling_face:<200d>↔<fe0f>

Sublime text :slightly_smiling_face:‍↔ except the second one is a circular arrow and there seems to be a dot or something inbetween

Presumably because:

The Head Shaking Horizontally emoji is a ZWJ sequence combining :slightly_smiling_face: Slightly Smiling Face, Zero Width Joiner and ↔️ Left-Right Arrow. These display as a single emoji on supported platforms.

I guess it’s not supported properly yet. :man_shrugging:

EDIT:

The left right arrow looks different in preview, like this :slight_smile: :left_right_arrow: