I've installed Joomla 4 beta 7 for development upgrading a Joomla 3 component. I have my logs (apparently) working correctly and I have test error log messages printing to the PHP error log as expected.

I have Joomla error reporting set to Maximum.

But when I try installing my component, it gives a pop up saying "Internal Server Error" and then there's nothing in the logs.

Can anyone suggest why there'd be no error messages printing to screen or to the error logs?

My php-fpm.d/www.conf shows

php_flag[display_errors] = on
php_admin_value[error_log] = /Users/myuser/php_error.log
php_admin_flag[log_errors] = on
php_admin_value[memory_limit] = 32M

and those are reflected in the Joomla phpinfo tab.