_ion-split-pane_ broken on iPad Pro?

We implemented a new app with ion-split-pane and realized that there is a problem only on iPad Pro. I am assuming it has something to do with that being screen size where the split pane kicks into gear?

The menu toggle button doesn’t work, and the left side of the screen is a large white block. As soon as I comment out the ion-split-pane tag, the problem goes away.