This tan hinge piece was included in 40433 and is even called out in the set inventory at the back of the instructions, but I cannot find any step where it is
LEGO 4513174 CROSS AXLE, EXTENSION, 2M - ROUGE
LEGO 6302735 CROSS AXLE, EXTENSION, 2M - BRIGHT YELLOWISH GREEN
LEGO Bright Red Technic Axle Connector Smooth 4513174 6538 (single,N)
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Inventory for 42144-1: Material Handler | Brickset: LEGO set guide and database