The "official" story, if it can be called "official" is that Young was very unhappy indeed with the band during the recording session, and, understandably in that situation, insisted on doing lots of retakes. After a while he got to the point where he walked out for half an hour to get his head into a better place before coming back and trying again.
Any of us who've been in a recording or practice session that we've found particularly trying or just couldn't get into for some reason must know what that feels like.
In the end the recording session simply didn't work. A second try a month later did.