As soon as the world divine barrier appeared with a crack, the gods that sensed it already became alert. The destruction of the world divine barrier is not something that can be simply done without years of preparation. It is something that needs to be deliberately planned to even attempt at succeeding became the demons will never allow it.
The gods at that very instant started to rage because this is something that could shatter the world. The Twin Gods being absent meant that the stability of the other gods will also falter. The Twin Gods acted not just as the leaders of the gods but also the wardens for those that planned to conquer the world.
