8.9.0 0d457d8d: left pane pin does not display, pinned navigation pane does not stay pinned
OS: Windows 8.1 Browsers: chrome Version 51.0.2704.106 m (64-bit), FireFox 47
Unless the browser is maximized, the left pane pin does not display, so the navigation context collapses on every context change.
With the browser maximized or in full-screen mode, the left pane pin does display, and you can pin the navigation context. However, as soon as you click on any icon in the pinned navigation pane, the pane then completely ignores the pin state and collapses again, making the pin setting useless.