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When did it deviate? Didn't it have prototype inheritance from the beginning?

I think having data containers with methods and inheritance is enough to qualify as object oriented.

It also had first class functions early, so one might argue that it was a functional language, as well. But philosophically I don't feel it was very close to the hard-code functional languages...

Then what's your take on the intent of introducing the concept of classes and class structure that's almost similar to any OOP based language? Wasn't prototypal based definition serving the purpose?

And, having just data-containers with methods and inheritance does not qualify it to be Object oriented. May be Pseudo Object Oriented. For that matter, almost any language can be represented to mimic a Data Container and to have its methods. Polymorphism and Data Hiding plays equally major role too.

As I said, JS was a functional language from the beginning but certainly it did not recommend the concepts of FP like Pure Functions, Lamdas etc. back then

Is has polymorphism, right? It's a dynamic language, you can just exchange one function for another and it works.

Data hiding is somewhat limited, but so is Python's, and I would consider Python to support object oriented programming...

It's all subjective of course, so feel free to disagree. But I feel your requirements for being a functional language are a lot lower than for being an object oriented language.