I’m late to put in my opinion, as the situation seems to have gone away with time. I just wanted to mention that it’s a natural security instinct for cats to avoid sick or injured animals. In the “wild”, if a cat is injured or sick, then infection can pass on to other animals. Natural instinct for survival would mean that the healthy animal should avoid the diseased animal. Now that the wound has healed up, then the other cat should have no reason to avoid the injured cat.
I have taken care of several sick and dying cats and this has always been my experience. I am not sure this would be the same with dogs or other animals.