Reddit header doesn't follow navbar

**Describe the bug**
In the Reddit webview example, when the navbar collapses, the Reddit header floats with a gap above it.

**To Reproduce**
Simply open the included webview demo and collapse the navbar.

**Expected behavior**
This could be a Reddit bug, but I'm wondering if there's anything that could be done to resolve this so that the Reddit header follows the navbar as it collapses.