Although some places regard Geng Jin's birth as an official injury, it is not absolute. The judgment of official injury and god of food should be based on the relationship between the five elements, not simply on the yin and yang attributes of the moon. Therefore, when judging the pattern, we should comprehensively consider the relationship between the five elements and other elements in the eight characters in order to draw an accurate conclusion.
In a word, the pattern of Geng Jin giving birth to the moon belongs to a kind between official injury and god of food, and the specific pattern needs to be judged according to the specific eight characters.