This looks like a bug in IASL, but I don't see where it came from.

The error that's causing the failure is this:
dsdt.asl 1950: Field (\_SB.PCI0.I2C2.PMIC.GPOP, ByteAcc, NoLock, Preserve)
Error 6100 - ^ Host Operation Region requires ByteAcc access

This obviously IS requesting ByteAccess, so I'll need to trace the issue through IASL to see where it thinks the issue is.

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