After PHP handler was uninstalled, it is displayed as a corrupted in Tools & Settings > PHP Settings :
Website assigned to the removed handler does not have PHP Settings button in Domains > example.com;
- Removed PHP version is still displayed in Service Plan > Service plan name > PHP Settings;
The issue is caused by bug with ID PPPM-7677, which will be fixed in the future updates.
Until the fix is released, a workaround can be applied: