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TAS6424EQ1EVM: Shutting down with more than 20V input

Part Number: TAS6424EQ1EVM
Other Parts Discussed in Thread: TAS6424E-Q1, TAS6424L-Q1, TAS6424MS

We removed the jumper to separate the inputs and have two separate supplies for PVDD and VBAT. When the PVDD supply running the amp module was turned up past 20V, the amp output shut off. We have even modded the board so that the 3V3 is generated from the VBAT line not the PVDD. What is causing this shut down if it is not the 6424 amp chip itself?