I picked up the east moon fragment before getting the quest. When I completed the west side I received the quest and it told me to go back to the east side but the fragment is gone because I already got it.
Of course this makes it impossible to progress. Going to the pearl altar does nothing. Also there is a typo on that quest line
Thanks EHG for fixing this. I feel heard. Also thanks to the community for being so patient. Really impressed with everyone’s ability to deal with an understandably frustrating situation.
I collected both fragments. Went into shrine area. No side altars. Went to center one, and it told me to collect the west one. Went there, there is no fragment there. Campaign stuck.