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To conclude this thread...
While grinding the plane blade down, I uncovered a defect (or two) in the blade. As I ground the blade down near my scribe line, I noticed a black smudge on the ground part of the blade. I assumed it was just metal filings and water, as I just quenched the blade. I made another pass and found the black spots still there. On closer inspection, they are voids in the hard layer of steel. I am making the assumption that these voids right at the base of the crack line, caused the fracture.
I was able to recover the blade and tap out the ura. This blade was very difficult to tap, and I had to hammer dangerously low on the soft layer of the bevel to eek out barely 1mm of flat. I somewhat forced the process by excessive flattening of the back, so the ura is not very attractive. In future, I will switch to a more pointed hammer, as Wilbur suggested.
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