MC33926 Motor Control Feedback Reporting Too High
A PCB manufacturing error caused this issue, R6 was unconnected to ground, so the motor controller was trying to force 1mA through the high impedance ADC, and the protection diodes on the chip shunted it to VCC, preventing damage by limiting it to 3.9V, and overflowing the ADC reading.

For the curious, the PCB error appears to be a manufacturing artifact.  The gerbers show R6 connected to a via (which is ground on the bottom layer), but the production PCB appears to have all the copper around that terminal removed.  I have a support request in with the PCB manufacturer, but my guess is they either automatically or manually removed the copper to avoid floating copper in the manufacturing process, but did so too aggressively.

There are marks suggesting an electrical test was done, however my guess is that it's operating based on the manufacturer's adjusted gerber rather than the original.