Audio Books Come Without Table of Contents lol?

I just purchased my first audio book. Wtf is the table of contents? I just see a superfluous list of “parts” which don’t correlate to anything useful. From what I can tell, Apple audio books do not contain a table of contents and everyone already knows this and nobody thinks it’s unacceptable. I had to buy the digital book as well so I can search it for terms stated in the audio book so I can find where in the book I am.

Tell me I am dumb, and the TOC is a click away. I realize it’s unnecessary for certain novels etc. But I’m talking about what is practically a textbook. Am I the only one trying to study and learn stuff? No TOC makes it hysterically difficult.