Apologies if this is a known bug,
I had an early fight where my druid (in bear form) was right up against an Entombed Warrior. The enemy had the Threatened status, but when trying to use Astarion's ranged sneak attack I got the tooltip "You must have Advantage". I double checked everything, Astarion didn't have disadvantage or anything. So as a test I moved to the next round and moved Shadowheart up within melee range of the warrior as well. Now Astarion could make the ranged sneak attack.
Any other druid form things I should know about? Already kicking myself for making a halfling and not having darkvision when in druid form