When I arrived in location "Coast of Wrecks" and was walking down with Edric. There was small glitches around the map where enemies and edric just dissapeared. I had to move around the map to make them visible again. I assume there are other maps that might suffer from this bug. It also might be connected with Edric himself? Unfortunately I can't tell you more but will update this ticket if I experience this bug elsewhere with or without a companion.
Best regards,
Duohh