On: Interesting Bugs Caught by ESLint's no-constant-binary-expression (2022)

[pests]

That is how it evaluates, not what the original author intended in the example in the OP.

    return a === b ?? c;

The intent was

    const bOrDefault = b ?? c;
    return a === bOrDefault;

You posted the actual (buggy) evaluation. I agree that its better if that is what you intend.