I experienced a bug with shadow blade today. I have Wyll built as a hexblade and he had his shadow blade equipped and bound as his hex weapon. In the middle of fighting Anders and his fake paladins of Tyr, Anders hit Wyll with a divine smite. Smacked him pretty hard and suddenly Wyll's shadow blade was gone. I checked the combat log and there was no mention of anything pertaining to the shadow blade. The game treated the shadow blade as if it required concentration and Wyll supposedly failed his concentration check. Except that shadow blade is not supposed to be a concentration spell anymore. So, there is definitely something wrong with the coding for shadow blade. I hope Larian fixes it soon.