Yes, there are some defects or incidents in this universe that fails newtons 3rd law of motion...
Friction, nature of body, impulse etc. are the reasons for unequal action and reaction. Mathematically, according to the conservation of linear momentum, m1u1+m2u2=m1v1+m2v2. The sum of linear momentum before collision and sum of linear momentum after collision is zero or equal to become the equal action and reaction. But if the sum of linear momentum before collision and sum of linear momentum after collision is not zero or if the values are not equal to each other, in this case we can say that action and reaction force are not equal. My new law states that “When any two matters come in contact, the action and reaction of the matter depend on its structure and condition.” It implies that the action and reaction can be equal or unequal also. There are many mathematical and practical experiments which prove that there are many defects. So, this law should be changed and should be wide the concept in a new law. Otherwise it is sure that it will bring more confusion among teacher and students in the world.