Why the beam isn't connected with corbel column?. Although blue dots is centre to centre with the column.

Solution:
The column material for Model Behavior is set as Precast Concrete.
This means that the element is not joining with other Concrete elements, like the beam. You can set the material to Concrete and the beam will join correctly.

Alternatively, you can make the beam Precast Concrete and adjust the cutback.

Source: Autodesk Forum

Bottom line:

Revit behaves as it was like in a real-world scenario. How could it possible if precast column corbel can be connected to a cast in situ beam. Maybe there's a possible way for this kind of connection technology. Any thoughts?