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Arduino band decoder issues with ICOM CI-V on 20m

Working on an Arduino Nano-based band decoder for my ICOM IC-7300 and getting inconsistent BCD outputs when switching to 20m. The CI-V interface works fine for other bands but 20m seems to output incorrect hex values. Using the standard pin configuration with optocoupler isolation - anyone else run into similar issues with ICOM CI-V band data?

Currently using the KW5GP decoder sketch with minor modifications for my antenna switch. Power supply is stable at 5V, and I've verified the CI-V cable wiring multiple times.

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