The black dude cannot only not die first, chances are good they cannot die at all.
It's not a stereotype, it's a rule. Black woman will always be heroic and powerful, especially if they're heavyset. Black men tend to be soulful and sympathetic, even if they are outright villainous in action.

In comparison white men are ALWAYS depicted as whimpering children at best, satanic monsters at worst. If you're a conscious part of a corporation you are evil or a whipped stooge. If you are a journalist you are altruistic and energetic compared to every independent commentator who is always a bigoted rabble rouser. Regardless of disability you can never portray someone as having difficulties in doing anything in fiction, even beyond reason (a person with a fake leg must always fight just as well as one without) Gay people have perfect relationships while monogamous couples are always bickering and breaking up. You're a noble savage or a cruel enslaving colonist.

Blah blah blah. You know all this by now. There are exceptions, but VERY very few.
It's a checklist, not an investigation of concepts. A white person MUST be like this and a non-white person MUST be like this in every instance.
And because of this, apart from the annoying double standard, it has crippled storytelling.

A reasonable strong white man seems to be the main character of a story? We'll all try to act surprised when he dies or is replaced almost instantly by a more diverse box-checking heroine even better than he could ever dream to be. A black person seems to be the villain? We'll all just have to gasp when it turns out the REAL villain was a white straight rich man the whole time!

This is deeply insulting, not even just to the people it's supposed to insult. The storytellers with this rubric think they are somehow elevating everyone except those foul white men to greater heights by pushing down the privileged majorities into the dirt as both vengeance for the past and to make the minorities heroes shine brighter.