I take it that your claim is that every class should always call super().__init__(), or else it's a bug? What makes you think so?
I say qualified because whether or not the bug warrants fixing is another matter. It's more warranted for public-facing APIs than internal code, since it's less practical for downstream users to modify your code. In your internal code, if your team knows about the issue or just avoids multiple inheritance altogether, or if you have some kind of static analysis to check class hierarchies for you, it might be safe to avoid. (Just listing some considerations that I can think of. There might be more.)
My overall point though was just to illustrate one particular example of a flaw that catches even experienced Python developers off-guard, let alone beginners.
For this to work, should every class also have an __init__ method that accepts zero arguments?
The solution is just to avoid inheritance. It’s full of terrible pitfalls in most languages, but Python more than most.