1.3 Alpaca continues to become pregnant

[arcane73]

Started a mod-free 1.3 playthrough and had 3 alpacas self-join.
2 males, 1 female. shortly after joining, she is pregnant. I sell one male and sterilize the other. Soon after she gave birth, she was pregnant again. She is now pregnant for the 5th? time with no visible means of becoming so.
The only step i have not attempted yet is separating her from the others.

I'm here to report that it seems that i have the alpaca of immaculate conception!

Link to save file:

https://1drv.ms/u/s!AqtB6p6Cle2f0gkoWAZDbq7sVopy?e=olEWjV

Moderator Note:
This should be fixed in 1.3.3067