What gameplay feature is this bug affecting?
It is showing up in my mutation lists but it's say

What's the issue? Please include any error messages you receive and as much detail as possible.
So I have a cub showing in mutations,someone thought it may just be because of the mother,but I have a dwarf with cubs too and they aren't showing up in my mutation list like this cub.

Any links relating to this bug? For example, if a particular lion is bugging, what is the link to that lion?
I don't have a specific link unless you can look at my mutie list from my profile.

Any screenshots you can provide us with?
I have a link for the mutation list screenshot.

https://ibb.co/C7CK7Xm

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 checked my mutations list in my pride,it said I had a cub in it,so I named the cub check so I could check it,when I checked it,it said it was perfectly healthy.