When griding grain (wheat, barley, etc) in the Create millstone, all primary flour outputs are generated with the proper spoilage time. However, the secondary flour outputs are generated as 'Rotten'. It is unclear if this happens when manually removing from the millstone as well, or if it only happens when outputting the contents into a chest through a chute. Outputting the contents into a chest through a chute will definitely recreate this problem.