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Early on in the crossover DLC I moved a shelf to access a hut with a locked chest under the floor in Kiltaraglen. At that time I didn't look for a key to unlock the chest. After exploring more of the island and gathering several of the shards, I have returned to the hut and found the key hanging from a tree branch outside, only now I cannot get at the key because the shelf I moved earlier to climb through the hut window has disappeared.
I have tried shooting the key, climbing on a horse, climbing the tree and jumping from the roof of the hut towards the key but nothing works. I am not loading a save from several hours ago just to loot a chest but I am disappointed that bugs like this are still happening.
A similar bug in London caused me to shelve the game for over six months until it had been sufficiently patched, maybe I should wait until the new DLC drops in March before playing again.