Analysis of samples brought back from the farside of the Moon by the Chang'e 6 mission have found the water content of the lunar farside mantle is much more depleted compared to the nearside.

China's Chang'e 6 lunar samples suggest our moon is debris from an ancient giant Earth impact

Source: space
Source Link: https://www.space.com/the-universe/moon/chinas-change-6-lunar-samples-suggest-our-moon-is-debris-from-an-ancient-giant-earth-impact