Sorry for the late reply.
When I put the memory breakpoint where the hash was, I reached an instruction that compared the hash against another value in a CPU register, which turned out to be the computed hash. When I edited the values so that the comparison passed, the chart was able to load correctly.
As an update, by observing which bytes in the chart were affecting the hash, and with an absurd amount of luck, I figured out what the hash function is. It's just CRC32 from the 8th byte to the last line in the chart.
When I put the memory breakpoint where the hash was, I reached an instruction that compared the hash against another value in a CPU register, which turned out to be the computed hash. When I edited the values so that the comparison passed, the chart was able to load correctly.
As an update, by observing which bytes in the chart were affecting the hash, and with an absurd amount of luck, I figured out what the hash function is. It's just CRC32 from the 8th byte to the last line in the chart.