It's in the garage above the garage door. Elsewhere in this thread I have more photos. (Sorry I'm new to let me and not good at directly linking on mobile)
The beam contains the center of tree which is prone to checking. The load bearing properties of the beam are predominantly on the outer sides not the center.
Seen enough deck posts on reddit to gather this is common and more of an aesthetic thing. Obviously you can ask a structural engineer for a real opinion. But this does not look all that concerning.
I'd be more concerned that your garage door spring is not enclosed. Those things get nasty when they pop. Sorry, I was thinking of a spring safety cable which is not applicable to this type of spring.