I have found the problem, unfortunately for you, it's a server issue, but maybe if you contact your hosting they will be able to fix it.

The problem is as I suspected with Phusion Passenger version==6.0.23 in the following link you can see someone who has already reported the incident, but has no answers yet (I will post mine soon) -» https://github.com/phusion/passenger/issues/2569

The solution I have implemented for this on my cPanel servers is to go to EasyApache 4 and downgrade the modules to ruby24-mod_passenger and remove the ruby27-mod_passenger versions with their dependencies, this will force Phusion Passenger to use version==6.0.7

With these simple steps we will have the servers working correctly again. If you have any questions, please do not hesitate to contact me. I hope you can sort it out on your end.

Kid regards, Harold.