Also I can’t call the “preprocess” function since there is no valid endpoint to be hitting

Wait now I'm confused, when you are calling " None " you are actually calling the preprocess function running on the inference container, and this one in turn (automatically) calls the Triton container.

Are you calling the Triton manually?
Could you share your preprcoess.py , and the command line you have used to register the two model versions ?
(based on your logs everything seems to be loaded correctly, hence my question)