Jeanne Martin that I merged had the same husband, same time frame, same city in France so I proposed the merge. I'm sure I merged it from the https://www.wikitree.com/wiki/Special:BrowseMatches screen for matches I proposed. It must have shown up as "You can complete this merge after a final comparison" or I wouldn't have tried to merge them. It is not uncommon for some of the merges to be approved quickly from when I propose them. Apparently this one didn't get approved but the complete this merge after a final comparison may have shown up anyway. I do not really know. That was two days ago and I have done a lot on Wikitree since then. I am an arborist, but I don't think that gives me any special abilities. I do not remember anything odd about the merge. I'm sorry that I cannot be of any more help. And I apologize if the merge causes more issues for the two profile managers.
My suggestion is (if possible) to log the proposed merges and approved merges, as well as the final merge (which is already done) into the changes log on the profiles and merge the changes from both profiles into the merged change log. That would at the very least allow the leaders to track what happens since apparently from the G2G thread, this has happened before.