[Launch Update, 12th Oct. 2019] I have recently noticed the same bug. My selected digger is pacifist as well and got strength instead of excavation in game. The excavating skill also happens to increase attack damage. Seems there is an old check that makes use of "senseless" skillpoints such as cooking on a dupe with gastrophobia. But i select my Digger to have someone who can dig and still choosing him despite him being pacifist means that i am ok with him not being a supersolider against poor critters. To my knowledge the game now does not even roll senseless skillpoint/profession combos anymore so the old check can be removed.