Guide: Frequent Download Problems

In 2021, I tried to report a problem I've had with the Light Furies and Night Furies, created by inactive member of the Restorers LilyValley. When the female of both species, after conceiving with either their own kind or the other fury, go to build a nest, nothing happens and their pregnancy status reset. I recently got a new computer, and it still doesn't work. I tried fixing the problem myself, but I can't find anything wrong with the programming. Any and all attempts to contact the creator, LilyValley, have received no response. I could really use some help figuring this out.

Some of the animals I downloaded throughout the years of playing ZT2 are supposed to reproduce by building a nest and then laying eggs in it, but after the female starts building the nest she suddenly stops, and her pregnancy status resets all while there's no sign of any nest. I have tried consulting the Frequent Download Problems guide, but there's no mention of how to fix this particular bug. Is there anyone who can help?