In the underdark, just fought the Duergar by the shore. Was collecting treasure and Astarion became heavily encumbered. After recognizing he couldn't climb due to encumberance, removed some gear and returned to myconid colony to sell. After reducing Astarion's encumberance below the encumbered level, he still had status indicating that he was heavily encumbered (e.g. movement slowed, cannot jump or climb etc.). Tried long resting to remove the condition as well as drinking a potion of hill giant strength (neither worked).

Also, could not pick up chain mail armor from duergar corpse with Tav despite having enough capacity to do so (based on 24.8 kg), but could with Shadowheart and Wyll.