I haven't found a similar topic to this one after a quick search, but if there is one then I apologize.

I noticed recently that you can make appearance changes to lions currently in a trade, which I think is potentially a means of scamming other players; What if you place an offer on a trade expecting the lion to look a certain way, then the owner edits their appearance (and potentially lowers their value exponentially) before accepting the offer?? This should be extended to removing/adding mutations as well, I think.

What I suggest is that there's a feature to prevent appearance changes to lions that are in trades OR lions that are in trades who currently have an offer on them. That way you're guaranteed to receive what you made the offer on, and not something random.