Sorry for the undescriptive issue title, I really didn't find better words to describe this.
If you choose Site's default language for the Selected language negotiation, LanguageNegotiationSelected will return site_default. LanguageNegotiator::negotiateLanguage() will try to find a corresponding key in the list returned by LanguageManager::getLanguages(), but there will never be such a key.
Because generally Selected language is the last negotiation plugin, what will happen is that no plugin was able to find a language, so LanguageNegotiator::initializeType() will fall back to the site default language... ...which is precisely the expected behavior.
So this is only a functional bug if Selected language is not the last negotiation plugin, which is inherently pointless, though. The behavior is still, well, weird.
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None.
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Postponed: needs info
11.0 🔥
language system
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
There has been no discussion here for 8 years, perhaps suggesting this is no longer relevant? Is this something that requires documentation?
Since we need more information to move forward with this issue, I am keeping the status at Postponed (maintainer needs more info. If we don't receive additional information to help with the issue, it may be closed after three months.
Thanks!