Why didn't Kangxi bury his grandmother sourdrang dowager for thirty years?

Why did Kangxi not bury his grandmother sourdrang dowager for thirty years?

According to historical records, sourdrang dowager told the holy father Kangxi before he died that the mausoleum of Emperor Taizong had been in Feng 'an for a long time, and the filial piety queen had been buried together, so we should not make a move to build it for ourselves.

And I have been thinking about Shunzhi and Kangxi in my heart, so it should be Anling near Shunzhi Xiaoling. When Kangxi was in power, he thought it was difficult to stop everyone from talking.

In the end, Kangxi once failed to bury Xiaozhuang, and Xiaozhuang's Zigong has been parked on the edge of Xiaoling Mausoleum in Shunzhi. It was not until the third year of Yongzheng (27 months after the death of his father) that the tomb of Zhao Qianling began to be built.

Extended data:

In China's traditional funeral etiquette, it is emphasized to be buried safely, but Kangxi did not bury his grandmother for more than 30 years. Although Yongzheng explained that Kangxi and his grandmother were deeply in love and could not bear to be buried together, it was always unreasonable and there must be convincing reasons.

After Xiaozhuang's death, Kangxi broke the routine and insisted that his grandmother live in the palace for three years. Later, due to the opposition of courtiers, Kangxi also went to Dai Xiao for nearly two years.

The feeling left by Kangxi's words and deeds to the world, in addition to pure filial piety, seems to have a very strong sense of guilt towards his grandmother, hoping to make compensation. Where this apology came from must be the hidden pain of Kangxi.

This secret pain is that Xiaozhuang had to do something against ethics in order to save the orphan of Huang Taiji and fight for his career all his life.

At this point, Xiao Zhuang not only failed Emperor Taizong, but also should understand and even be grateful to Emperor Taizong. However, due to secular etiquette, Xiaozhuang could not be buried with Emperor Taizong, and suffered great injustice, which was a hidden pain in Kangxi's heart forever.

Why didn't Kangxi bury his grandmother sourdrang dowager for thirty years?