When i disable an extention that use the event "acp_overall_footer_after" i get a white screen after the mouseclick on "Return to the extension list".
I test it with boardannouncements and stopforumspam.

Error Message:
[22-Jan-2022 09:53:15 MET] PHP Fatal error: Uncaught Twig\Error\LoaderError: There are no registered paths for namespace "phpbb_boardannouncements" in "overall_footer.html" at line 42. in /.../powwow_3-3-6/vendor/twig/twig/src/Loader/FilesystemLoader.php:227
Stack trace:
#0 /.../powwow_3-3-6/phpbb/template/twig/loader.php(135): Twig\Loader\FilesystemLoader->findTemplate('@phpbb_boardann...', true)
#1 /.../powwow_3-3-6/vendor/twig/twig/src/Loader/FilesystemLoader.php(150): phpbb\template\twig\loader->findTemplate('@phpbb_boardann...')
#2 /.../powwow_3-3-6/vendor/twig/twig/src/Environment.php(299): Twig\Loader\FilesystemLoader->getCacheKey('@phpbb_boardann...')
#3 /.../powwow_3-3-6/vendor/twig/twig/src/Environment.php(381): Twig\Environment->getTemplateClass('@phpbb_boardann...')
#4 /.../powwow_3-3-6/phpbb/template/twig/envi in /.../powwow_3-3-6/vendor/twig/twig/src/Loader/FilesystemLoader.php on line 227