"every slot in it is one the compiler made up" is a claim about the body this session holds, not about the frame, and it was answered before either body check ran — so a zero-slot frame whose body had since been replaced by one with slots got that note instead of the refusal. No values were misattributed, which is why it is not the defect just fixed, but the reason given was untrue. The count and fingerprint checks now run first and the note is the last arm.
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