Do not use .hidden class to mark cell in grid as hidden
In e5446fb8d4ce the .hidden class is added to cells to remove the padding of empty but Boostrap defines the same class with display none. So once a cell is marked as hidden, it stays hidden.
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In e5446fb8d4ce the .hidden class is added to cells to remove the padding of empty but Boostrap defines the same class with display none. So once a cell is marked as hidden, it stays hidden.