Why is the original god Mu Ning not here?

Not all the incidental tasks have been completed. Trigger muning step:

1. First, accept the world mission, find Kathleen, talk to her, and then get the task of finding Yue Hui.

2. Secondly, after the dialogue is completed, complete the task of finding and releasing the entrusted miners near the rock abyss of the stratum according to the prompt.

3. Then the miner talked to him after Yue Hui. After the conversation was finished, he received the task of talking to Mu Ning to learn about the strata and rocks.

Finally, next to the miners is Muning. After the conversation with him was completed, Muning's task was triggered.