I just resawed a (QS oak) plank that popped out like a clamshell and actually split the last couple inches of the plank. Now there is about an inch of space in the middle between the two resawn halves of a 40" 8/4.
What's a good way of assessing whether wood has residual stresses prior to resawing? FWIW, this plank was KD and sat in my shop for a couple of years. Since we just came off a humid summer, it's plausible the outside has a higher MC than inside. I dehumidify my shop to 70% in the summer, and try to keep it above 30% in the winter.