I apologise for the poor quality of this report, I will add more information (such as the version number and steps to reproduce) once I am back on WiFi and using my PC.

The issue

I have noticed that foxes that are born into berry bushes take damage from the bush. Foxes of all ages are supposed to be completely immune to damage from berry bushes.

The newborn fox is only damaged once by the bush. I have only tested this with arctic foxes but I am sure, as they are practically the same, that it also occurs with normal foxes.