mdx-deck: Appear: Missing Props

Hi there – just started with mdx-deck. It’s awesome, thanks!

But having some issues with using Appear. As soon as use the component the following errors occur and the app breaks.

Warning: Failed prop type: The prop `slide` is marked as required in `Appear`, but its value is `null`.

Warning: Failed prop type: The prop `deck` is marked as required in `Appear`, but its value is `null`.

Haven’t found any hint in the docs.

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env npm: 6.2.0
node: 10.9.0
@mdx-js/mdx: 0.15.0
mdx-deck: 1.6.4