I've conducted further testing and found that reverting to an older DepthAI version allows one IMX477 to work intermittently:
python3 -m pip install --extra-index-url https://artifacts.luxonis.com/artifactory/luxonis-python-snapshot-local/ depthai==2.26.0.0
The board itself is fully functional, as I have successfully used four Arducam IMX477 cameras. However, it seems there may be an issue with the board's reset function.
Additionally, I noticed a discrepancy in an older post (https://discuss.luxonis.com/d/2089-adapter-board-for-raspberry-pi-global-shutter-camera) where the circuit shows resistors R3 and R4 installed, which is not the case with my adapter board.
As a next step, I plan to try removing the R7 resistor from the HQ Camera Module.

Any insights or suggestions would be greatly appreciated!