Resilient khenra’s eternalize still gives +x/+x where x is his actual power and toughness instead of +4/+4.
It looks like this bug as always been here, it should be an easy fix but it’s still haunting the trial of the planes.
I don’t think anyone is positive whether or not it is a bug. The paper version gives the +x/+x, so it isn’t totally random that the pq version does. And like you mentioned, it has always been around even after being “fixed”