"Diagnostics -> Information -> MS Domain" does not work as expexted. If enabled "Access -> Active Directory", it shows "AD authentication is disabled." and vice versa.
It seems to be in the file "diag_infos_ad.php" missing parentheses:
should be if(!(is_bool($test = $config['ad']['enable'] ?? false) ? $test : true)):
instead of if(!is_bool($test = $config['ad']['enable'] ?? false ? $test : true)):
.
fixed with commit 6007