I found a unexpected behavior when trying to turn a light card into a dark one

Expected behavior

Using "dark" property on card changes light card into dark one

Actual behavior

Nothing changes. (There isn't even a style associated with the class card-dark)

The card stays light

Resources (screenshots, code snippets etc.)

<mdb-card dark>
    ...
</mdb-card>

I'm using MDB on an existing project running with vue-cli template and typescript enabled.

I know the documentation recommends using "dark" in conjunction with

<mdb-card-body color="elegant" class="white-text">

but I think this doesn't serve the purpose of using templates. (it introduces more boilerplate code)

Is this behavior intentional?