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Wow I missed a lot while working. I must say, to me, in that picture it looks like the seat broke...maybe a couple chunks. The burnt seats I have looked at I don’t recall looking like they were missing a chunk. Maybe I’m wrong. Usually aggressive valve seat angles combined with lots of heat will cause the angle to burn. I bet your valve was bouncing and possibly caused that seat to chip.
Regardless again maybe my eyes are playing tricks on me but.....I think that seat chipped from what I can see.
It would be interesting to know how many angles were used for the valve job and what degrees were the angles machined at.?
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