mstyle mathvariant inheritance and mi

We've run into this in an example we're testing with:

<mstyle mathvariant="bold-italic">
 <mi>B</mi>
</mstyle>

The user-agent rule mi { text-transform: math-auto } is overriding the rule text-transform: math-bold-italic which it's inheriting from the mstyle.

I'm aware that there will be some changes from MathML3, and from reading https://github.com/mathml-refresh/mathml/issues/1 and https://lists.w3.org/Archives/Public/public-mathml4/2019Mar/0007.html it seems you're aware of this situation already. But I couldn't find a resolution for this specific situation.

If overriding the mathvariant attribute on the mstyle is intentional, that's fine. But if not, it's quite easy to continue to support this syntax by adding

mstyle[mathvariant] mi {
    text-transform: inherit;
}

to the user-agent stylesheet.

Start with the provided mstyle/mathvariant example and review how MathML Core defines inheritance alongside the user-agent rules for mi. Compare the existing behavior with the proposed mstyle[mathvariant] mi rule, then confirm whether the specification or stylesheet should change and verify the resulting rendering.