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Guys first time having a brick issue with relatively new pieces. Had hairline split on 4 of the same bricks that came from 2 mixel sets. Only used them in the original build and then one MOC. Used the center hole and had a bottom connection. 2 were used in the MOC while the other 2 were not used after the Mixel was disassembled.
Going to try to get Lego to replace. Common problem with this brick or possible mold issue?