There is a recommendation to use the "SameSite" attributes on cookies, but this module doesn't use it.
Install, make the a11y block available, click on a button and check for console messages on the browser.
This appears:
Cookie “a11y_textsize” does not have a proper “SameSite” attribute value. Soon, cookies without the “SameSite” attribute or with an invalid value will be treated as “Lax”. This means that the cookie will no longer be sent in third-party contexts. If your application depends on this cookie being available in such contexts, please add the “SameSite=None“ attribute to it. To know more about the “SameSite“ attribute, read https://developer.mozilla.org/docs/Web/HTTP/Headers/Set-Cookie/SameSite
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2.0
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It's likely this issue predates Contrib.social: some issue and comment data are missing.