Static routes does not work if no language serves root level
In our configuration we've set all languages with a prefix (DE and EN).
We are using /de for German and /en for the English page.
In this case TYPO3 is redirecting every site which does not match to one of the prefixes (/de and /en) with a 307 to the default language ( /de which is fine so far).
The bug is that this behaviour happens also for static routes. In our case /robots.txt (defined as static route) is redirected to the /de page.
TYPO3 version: 9.5.7