I just went back to a way older save from before Mai was pregnant and it is slightly different then without any typos that I saw. Didn't matter if I picked Miko or Mai as my favorite. (I couldn't check without picking one but that's my only save from before Mai's pregnancy). It also didn't matter if Kiyoko was pregnant or not.
EDIT because I do not want to keep replying to my own post: After checking more the error is only present when Mai is pregnant. All other permutations of the scene do not have any errors as far as I can tell.