I've noticed an issue in the quest from Annavene Selas. In "present" topic, when giving the potion to Vidam Deris, it doesn't get removed from equipment. This is because the command to remove it, doesn't target the player (removeitem "TR_m2_q_4_AnnavenePoison" 1). The bug is present in both ways to feed Vidam the poison.

Also, the poison itself has a wrong mesh, because according to the icon, it's a common flask, while the mesh is from a quality potion.