What gameplay feature is this bug affecting?
reverse breeding

What's the issue? Please include any error messages you receive and as much detail as possible.
I accidentally retired my lion after reverse breeding her and the person who bought the heat still got the cubs. Issue is solved but I was told to submit a ticket here as it counts as a bug.

Any links relating to this bug? For example, if a particular lion is bugging, what is the link to that lion?
https://www.lioden.com/lion.php?id=794174524172 This is the lion.

Any screenshots you can provide us with?
Unfortunately no as this happened yesterday and I was wondering if it was a bug or not and reported it to the modbox instead of the bugbox.

Please provide us with step by step explanation how this bug happened so we can attempt to replicate it. If it's complex, please include screenshots where possible:
I have some lionesses that I reverse breed. This particular lioness, castle was at retiring age. And so I retired her. But before doing that I checked that someone bought a heat from her. And I had accepted the heat. Then I went on with my day as if nothing happened. It wasn't until I went to feed her yesterday from the pregnant lion page that I realized she was dead. And well.. she had a day left to give birth. I was so confused. I didn't know if the person who had bought the heat would get the cubs. They did fortunately.