They did publish a study on this...
Google Translation of this:
"Shiori Toki, Hiroki Ishihara, Chiemi Iida: Effects of timber tapping on dried shiitake mushroom log cultivation Kyushu Forest Research 73: 143-145, 2020 In dried shiitake mushroom log cultivation, watering and felling the logs to promote shiitake mushroom emergence are called emergence operations. One of these is the tapping process, in which the logs are tapped after rainfall or while being watered. There are cases where the amount of emergence is secured by performing bed raising in the first year after inoculation and tapping in the second year at production sites. However, there are no concrete examples of the emergence effect of tapping. In this study, we investigated the effect of tapping on shiitake mushroom emergence in a one-year raising test and a tapping method examination test. In the one-year raising test, the amount of emergence increased with tapping, but the effect on the quality and the diameter of the mushroom umbrella was small. In the test to examine the method of striking, it was found that the amount of occurrence increased with the number of times the trees were struck, and that the amount of occurrence tended to increase when the end of the tree was struck rather than the bark."
https://jfs-q.jp/kfr/73/p143-145-01.pdf