- Plesk Onyx
- It is possible to create service plans with PHP handlers which are disabled under Tools & Settings > PHP Settings.
- Subscriptions that are created based on such service plan are actually using PHP handler by OS vendor.
This is Plesk bug with ID #PPPM-8495, which is planned to be fixed in future Plesk updates
Currently, there is no workaround. Since subscriptions do not use disabled PHP handlers in fact, this behavior can be ignored.