Skintone for some emojis is rendered incorrectly

Summary

For some reaction emojis and in markdown emoji skin tone is not rendered properly.

Steps to reproduce

Add :handshake: and :handshake_tone1: as reaction emoji or markdown emoji.

What is the current bug behavior?

The same image is displayed for emojis with all the skin tones as well as without skin tone specified.

What is the expected correct behavior?

Different image should be displayed for emojis with different skin tones specified.

Relevant logs and/or screenshots

Reaction emoji Markdown emoji

Output of checks

This bug happens on GitLab.com

Possible fixes

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