Popover not really gone?

I have a split-screen app with a popover invoked from an icon in the header, similar to the popover example. See this codepen. Everything works great, except after the popover closes, it seems like the popover-backdrop still blocks mouse/touch events, even though the backdrop is display:none and no longer class=active. If I make the screen narrow enough so the left menu hides, I find that I can still do a drag to expose the left menu, even though other actions like scrolling or navigating don’t work. And once I’ve exposed the left menu, then the actions return to normal again. Can anyone help me with this?

Seems to be resolved in the nightly builds.

Thank you, very cool.