946a10e7a7
The labelled set has a RIFF and the scan is unbounded, so it reads past the RIFF there -- the headline number could have been borrowing discrimination that a RIFF-less bank cannot offer. Confining the scan to the leading region gives 69.98%, which looks like exactly that problem. It is not. Split by how much leading audio there is: on the 989 banks with >=24 packets of it, the scan is 100% correct with ZERO ties, whether or not the RIFF is in range. The 69.98% is an artifact of short leading regions, where two or three packets are not enough to separate candidates. A RIFF-less bank is a whole pak entry, so 24 packets are always available. The 99.62% is conservative for the population the scan serves, not optimistic.