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@merkys7 thank you for working on this 👏🏻 . It would be great if you can add testing instructions.

I tried to test this but as far as I can tell, this icon is never used? When I add the block, I can not find an option to use it.
"Share" is not listed as a variation here: https://github.com/WordPress/gutenberg/blob/trunk/packages/block-library/src/social-link/variations.js
What problems does the missing size cause?

I tried to test this but as far as I can tell, this icon is never used? When I add the block, I can not find an option to use it. "Share" is not listed as a variation here: https://github.com/WordPress/gutenberg/blob/trunk/packages/block-library/src/social-link/variations.js What problems does the missing size cause?

yes right, even I was not able to figure it out. That's why I asked the author for steps to reproduce.

It is used as a fallback, if there is no Icon for the service: https://github.com/WordPress/gutenberg/blob/trunk/packages/block-library/src/social-link/index.php#L96

You can test it by editing the code like this:

<!-- wp:social-links -->
<ul class="wp-block-social-links"><!-- wp:social-link {"url":"https://wordpress.org/","service":"this-does-not-exist"} /--></ul>
<!-- /wp:social-links -->

Congratulations on your first merged pull request, @merkys7! We'd like to credit you for your contribution in the post announcing the next WordPress release, but we can't find a WordPress.org profile associated with your GitHub account. When you have a moment, visit the following URL and click "link your GitHub account" under "GitHub Username" to link your accounts:

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Kudos!

Just noting that this was also reported in Core Trac and linking.