Found a pretty minor bug. I'm on Windows 10.
I think I had just talked to the rock climber kid on the side of the mountain when Claire's climbing animation stopped showing. After a few minutes spent animationlessly acending hills because it was quite funny to watch, I both forgot any more exact possible triggers and noticed that the frozen feather graphic wasn't showing and I couldn't use items.
It resolved itself with a exit and reenter though.
Only bug I've encountered in an absolutely lovely and incredibly enjoyable game :)