Since update, game crashes on aging up toddler and then saving

I was able to work around the problem by aging the baby up to a toddler as normal, and then instead of saving:

• I typed 'testingcheats on' and then 'cas.fulleditmode', then shift-clicked the toddler to enter CAS, and then aged the sim up to a child.
• Then I saved successfully.
• Next, I shift-clicked the sim again and entered CAS. I aged the child back down to a toddler.
• I was then able to save the game with the sim at the correct age.

It's not a perfect solution, but it got my game saved, at least.