Both were cut from the one board at the same time & exactly the same orientation but this has only happened on the one.
That points to the wood (more specifically the grain direction, or hardness) as the culprit. Softer woods are more prone to tearout. I get it with poplar a lot.
Sometimes climb cutting can help, but not always. Larger diameter bits can help, as well.
We used to make some parts where we used a right hand bit for one half, and a left hand bit for the other half, to guarantee we were never cutting against the grain. That's the only way to totally eliminate it 100% of the time.