What does the incense ash crack mean?

This is superstition. People trapped by troubles try to escape their troubles by worshipping gods, which is an act of deceiving themselves and others.

In the past, people regarded some things that could not be understood and explained at that time as the handwriting of gods and ghosts, and thought that there were souls, gods and monsters in the world. However, with the continuous development of society and science, some things that were difficult to explain in the past can be explained clearly and it can be confirmed that there are no ghosts and gods. However, some people still believe in ghosts and even infatuation. This is superstition.

Folk say incense ashes don't drop, illustrates some things:

In some places, the incense sticks, indicating that the souls of the deceased at home are here and have been reluctant to leave for a long time. There are rumors among the people that if this happens, you can take some paper money and burn it after praying, and the soul of the deceased will leave, and the incense ashes will naturally fall. Although this statement is mysterious and has no scientific basis, some people still believe it. Perhaps this is true or false, which is a comfort to the living.