just an idea
In this post the solution was
sudo a2dismod php7.4
sudo a2dismod mpm_prefork
sudo a2enmod mpm_event
sudo a2enmod proxy_fcgi setenvif
sudo a2enconf php7.4-fpm
sudo systemctl restart apache2
sudo systemctl restart php7.4-fpm
and have a look at “all” your php-fpm settings
# grep -R “memory_limit” /etc/php/
check if any “memory_limit” value is out of your prefered range
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