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Gloomhaven Elemental Infusion Board Fix

Import the chest into Gloomhaven mod.
Click the button on top of the chest before adding play area.
Click the "Add Play Area" button.

If it will still be broken, reload fresh game, import the chest.
Click the "Add Play Area" button.
You will get script error, ignore it.
Manually drag the bag out of the chest.
Bag contains all objects which are needed for Elemental Infusion Board.
Put those objects onto play area.
Delete the chest.