What gameplay feature is this bug affecting?
Hunting

What's the issue? Please include any error messages you receive and as much detail as possible.
An older lioness that I had in a hunting party passed away naturally. Upon her passing, she was sent to my dynasty. Her name became italicized in the hunting party as usual and she was unable to hunt. After I sent the hunting party out (with a replacement for her slot), I used a Canopic Jellyfish item on this lion to freeze her. She was never removed from the hunting party nor was it disbanded, so when I sent my next batch of lions out to hunt, I realized that her name was no longer italicized. I was able to send the party out as normal with her included, despite the fact that she was both frozen and no longer set to a hunter.

Any links relating to this bug? For example, if a particular lion is bugging, what is the link to that lion?
Lion in question

Any screenshots you can provide us with?
1. Proof that the lion in question was frozen.

2. Proof that the lion in question was sent out to hunt AFTER she was frozen and successfully returned.

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:
1. Have a lioness die (presumably of old age) who is in a hunting party.

2. Use a canopic jellyfish on her.

3. Send the hunting party out.