MgCO3 is not very soluble in water. You didn't include enough information about how you're making it so I can't even guess as to what impurities it might contain. I can guess that there must be a major impurity such as the bicarbonate [Mg(HCO3)2] that is much more soluble in hot water than the carbonate.
Whenever there's a rinse in a synthesis, you can bet that the solvent recommended dissolves an impurity a whole lot better than what you're washing.
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