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As per Wiki: "In addition, if a character has a crafting skill of at least the DC of the crafting check she makes a Mastery Roll versus the DC + 20. Succeeding this check overcomes failures in starting a project or adds one extra point of progress for active projects."
However, this does not appear to be the case. I've had this happen a few times before, I recall mastery saves working appropriately a while back, though.
Steps to reproduce
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Fail a craft attempt when your skill exceeds the DC of the item you are trying to craft.
Expected result
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Mastery roll comes to the rescue and gives you a chance to save.
Actual result
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You just fail.
Screenshot(s)
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Lightshot failed me and screenshot disappeared. But here's another example from another craft fail with no roll. This time beat the DC by 2, but it's my understanding it should still trigger a mastery roll.

Notes
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Skill: 20
Item: Glass Vial
Craft DC: 3
Skill: 37
Item: Assembly Template (Stable)
Craft DC: 35