I specifically tested the update with a game in progress that had females who had been made young again. Some were still nursing, others were not. In every case, the females who were not nursing a baby, even if they had been made young again, were able to nurse their infants for the correct amount of time (i.e. 2 game years).

If there are still issues, I need to know what exact steps need to be performed in order for me to reproduce any remaining bugs.