Legacy Family Trees: Tree collapses/Overlaps/ Wrong connections (1.121.361)

My main sim is a twin, and after the update, they have almost merged into one another in the family tree unless viewing from the highest level. You can see it in the image, but my twins (4th line) show up when viewing from the eldest family member, but when I view from her child's POV, the mother disappears and is replaced with her sister. Relationships still show up in-game (correct sim labelled as mother, etc.), but on the family tree she completely disappears. I have reset the relationships using MCC, and it still hasn't changed. What can I do here....