Apache error log is flooded with warnings like this:
[Fri May 09 22:07:02.345422 2025] [proxy_fcgi:error] [pid 242757:tid 242799] [client 24.91.254.109:40622] AH01071: Got error 'PHP message: PHP Deprecated: Use of InterwikiLoadPrefix hook (used in MediaWiki\\Extension\\Interwiki\\Hooks::onInterwikiLoadPrefix) was deprecated in MediaWiki 1.36. [Called from MediaWiki\\HookContainer\\HookContainer::register in /var/www/mwfarm-git/w/includes/HookContainer/HookContainer.php at line 436] in /var/www/mwfarm-git/w/includes/debug/MWDebug.php on line 385'