R2 is 1k and is the load. The emitter resistor is not the load. Ohm's law shows that 20mA in 1k needs a voltage across the 1k to be 20V. But the supply for the transistor is only +12V, far from 20V.
You correctly show the emitter current at 18.52mA but then the 1k collector resistor must have the same current then it will have 18.52V across it which is impossible.
Why don't you understand that when the transistor is turned on as hard as it can then increasing the input voltage does not allow the transistor to control the current anymore?