Why is "Cuckoo Mountain" not a model theater?

The model plays are as follows:

First of all the modern Peking Opera "Cuckoo Mountain" is a model play. It is after the modern Peking Opera "Tale of Red Lanterns", "Shajiabang", "Zhiqi Weihu Mountain", "Harbor", "Strange Attack on the White Tiger Regiment" as well as the modern dance drama "White Hairy Maiden", "The Red Detachment of Women" and the symphonic music of the Shajiabang which is the eight model opera plays, it becomes the second batch of model operas.

Introduction:

Peking Opera, also known as Ping Opera, Beijing Opera, etc., is China's most influential type of opera, the distribution of which is centered in Beijing, throughout the country.

In the Qing Dynasty, since the 55th year of the Qianlong era (1790), the original performance in the south of the three Qing, Sisi, Chuntai, and spring the four Huiban one after another to enter Beijing, and the Han tune artists from Hubei, while accepting part of the repertoire, tunes, and performance methods of the Kunqu and Qinqiang, and absorbing some of the local folk tunes, and through continuous exchanges, fusion and ultimately the formation of the Peking Opera.