Thanks to Carbide3D, I received both the new @robgrz front plate extension and bitsetter cables during setup which I installed at first.
In trying to troubleshoot, I swapped out each of the cables one at a time. When I got to the “correct” bitsetter and the “incorrect” front plate extension everything started working! I tested both bitsetter and bitzero v2 (SO5 version) and they performed exactly as expected.
Very thankful for all of your help. Without a schematic to continuity test, swapping cables one at a time worked pretty good.