A metal cube is placed in an empty vessel. When water is filled in the vessel so that the cube is completely immersed in the water, the force on the bottom of the vessel in contact with the cube -

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The force on the bottom of the vessel in contact with the cube remains the same. This is because the water exerts an upward buoyant force on the cube, which is equal to the weight of the water displaced. This buoyant force acts on the cube, not on the bottom of the vessel directly. The pressure at the bottom of the vessel is due to the weight of the water above it plus the weight of the cube. When the cube is immersed, the total downward force on the bottom of the vessel remains the same.

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