Issue: Some fallback emoji's return 404

[Dvd-Znf]

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Bug

Body

When trying to change profile status, some emoji's are unavailable:

Example of working fallback png: https://github.githubassets.com/assets/1f499-b0ffe7066624.png
Example of not working fallback png: https://github.githubassets.com/images/icons/emoji/unicode/1fa75.png

Steps to reproduce:

• Use latest version of firefox on linux.
• Try to change account status

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[Dvd-Znf]

This might be related to #22368