Bug Animation Override Controller Is Bugged

I have followed multiple guides and the official documentation multiple times from the ground up and I encounter the exact same issues each time.

• I have a base animation controller with all the transitions I want, I give default animations to each of the states in this base controller.
• I create an animation override controller, add the base controller to the Controller in the inspector, and add the override animations.
• I give that override controller to the NPC's Animator component (I have tried every update and culling mode, as well as checking/unchecking Apply Root Motion in every possible variation to no success)
• No matter what, once the game runs it will always override my override by pointing to the base animations and ignoring the overrides I dragged in.

Here is the Animator component for my NPC pointing to the override controller:



Here is the Animation Override Controller before runtime:




Here is the Animation Override Controller during runtime (totally wipes my animations):



I'm labeling this as a bug because there is no reason this should be happening, I asked people personally and they said it looked like a bug as there should be no way this is happening.