I think ive done like 20 different speedruns testing if i could figure out something to fix it. Ive tried playting as shadowheart, having her in my party, not having her, having her killed, not playing as durge, playing as durge, etc. Nothing fixes it. The cutscene just breaks i think, because it doesnt play. I just instantly TP to camp and its forcing a long rest, with the artefact appearing in my hand. yet when i go back, the cutscene doesnt play. Im pretty sure the cutscene is supposed to play, then the aretfact is added into your inventory.