After v90.0.15 update, PHP only spawns 2 processes & uses more CPU?

Hi, I am using WHM v90.0.15 (just updated). Apache 2.4.46, PHP 7.3.23 (FastCGI), MPM_Event. After I updated to 90.0.15 and restarted my server, PHP is now only spawning 2 processes, instead of 3. Even when I run PHP/FCGI on my Windows PC, it spawns 3 processes, and it's always spawned 3 on my VPS. PHP also seems to be using more CPU when loading websites (though this could be because it's only running 2 processes instead of 3). What about this update could've affected PHP? Edit: Just tried opening several websites on the server at once, to make PHP have to work harder... Apache/PHP will simply not spawn an additional process. Why was it always 3 processes before, but now only 2?