centerMode does not work with rows

I'm trying to get centerMode to work with rows. I have 4 cards in 2 rows of 2 each.

Here's the issue replicated in the sandbox: https://codesandbox.io/s/vj3mm485z7
I can provide more of my actual code if that helps.

Is it possible to use `centerMode: true` and `rows: 2` and `slidesPerRow: 2` ?

Thanks!