Except that "PHP is meant to die", i.e. doesn't perform well as a long-running process, you'll keep running into bugs and warts. Software Gunslinger has explained that well: https://software-gunslinger.tumblr.com/post/47131406821/php-...
I also meant long-running processes, which it sounds like is still problematic. To be fair, it doesn't sound like PHP was ever designed to be used for long-running processes, to which I guess "Fair enough", but that might make things like a job worker queue more complicated if you want to write the workers in PHP (it sounds like you'll need a dispatcher in a different language because that would be a long-running process).
Have you reported them upstream? That implies a memory safety or garbage collection bug.