It may or may not be a feat actually. Some creatures fly via the flight boon rather than having the feat. Since the way things work are governed by the GM, it’s the GM that dicedes:
- What you can shapeshift into
- How that affects you
- What benefits you gain
Maybe you get some of their feats, maybe not, maybe you keep yours, maybe not. There are way too many variables from the setting to the things the GM might have in mind for the world to flat out say in the rules, and that is why it isn’t explicitly stated.
It’s like the Climbing feat, although it can give you the ability to walk upside down on walls, that might not make sense for your character. Maybe your character is just a natural climber, so they are able to scale up walls without worry of doing any sort of might or agility or other rolls, but they can’t just hang there upside down like the would be walking on the ground.
Climbing used to have 2 tiers, one that allowed good climbing,a nd one that allowed the upside down. B/c of the cost ratio, it was just dropped to 1 tier, and left for the player and GM to decide, like many things with Open Legend, that make sense for the situation.