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The reason it cracked is you have wood in the middle with the grain running perpendicular to the wood on the face. When the wood on the face shrank the joints failed to releave the stress. Wood has to have the ability to expand and contract.

From where you are I think I would just putty the gaps in the joints and go ahead and finish it. You could machine the joint and insert some strips of wood but it wouldn't help it structurally and would be unsightly. Another option would be to use a router and run a V groove on the joints. Then it would have the appearance of individual planks.
 
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