Hey! I've noticed that hand cannons will not be directly attached and moving with your character, when the season 3 ornament for the Iron Truage Boots ("Haakon's Iron Strides") is applied. Everything is working properly without the ornament or other leg pieces. Tested several hand cannons and side arms, but they all seem to just levitate next to the character.
Check the youtube link to see what it looks like.
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Reminds me of quivers of arrows in Skyrim. Once you notice it, it's super annoying.