Camera actor doesn't show input category in defaults

The title says it all. The Input category doesn’t appear in the class defaults for the camera actor class. Also anything related to input such as Disable and Enable input nodes do not work in a class that inherits from CameraActor.

Another funny thing is that any variables that is put in the “Input” category just completely disappears from the class defaults panel.

This situation also happens with the 4.15.3 version.

Why does this happens only with CameraActor class?