That could be Easyapache3 one. Phalcon was appearing as a blank option in easyapache3 extensions. There was an update to Easyapache3 which broke adding phalcon as an extension. It could be that one couldn't it?
https://github.com/thecpaneladmin/EA-PhalconPHP
The notes say:
*** PLEASE BE AWARE THAT THIS MODULE IS SPECIFICALLY FOR EASYAPACHE 3. EASYAPACHE 3 IS DEPRECATED IN FAVOR OF EASYAPACHE 4, SO THIS MODULE WILL NO LONGER BE SUPPORTED ***
I tested in Centos Cpanel Easyapach4 with Phalcon (which came as an in built option) and it worked for me fine.
The supported one is here:
https://github.com/CpanelInc/scl-phalcon
well, we had user here with that "easy" thingies where Phalcon didn't work - and he could not find root cause.