Popups do not render correctly in RTL mode

Environment

react-native-cli: 2.0.1
react-native: 0.60.6

System:
OS: Windows 10 10.0.18363
CPU: (12) x64 Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
Memory: 15.66 GB / 31.93 GB
Binaries:
Node: 10.15.0 - C:\Program Files\nodejs\node.EXE
Yarn: 1.16.0 - C:\Users\davchi\AppData\Roaming\npm\yarn.CMD
npm: 6.4.1 - C:\Program Files\nodejs\npm.CMD
npmPackages:
react: 16.8.6 => 16.8.6
react-native: 0.60.6 => 0.60.6
react-native-windows: 0.60.0-vnext.150 => 0.60.0-vnext.150
rnpm-plugin-windows: 0.3.5 => 0.3.5
Installed UWP SDKs:
10.0.17763.0
10.0.18362.0

• Target Device: Desktop
• Visual Studio Version 2017
• Build Configuration: Debug & Release

Steps to Reproduce

1. Have the system enter Right to left text flow direction mode
2. Create a component that renders a popup with no specified anchor, such that it becomes anchored to the app window.
3. Make sure the popup that is rendered with width and height of the app window.
4. Have the popup appear and observe

Expected Behavior

The popup since it is anchored to the app window and is the height and width of the app window should appear and cover over the app window.

Actual Behavior

The popup appears translated by the screen width to left hand of the screen. See screen cap. The content inside the popup correctly adheres to the RTL flow direction-- it is just that it appears in the incorrect location.

No source file or test is named. Start by reproducing the popup behavior on Windows with react-native-windows 0.60.0-vnext.150 while the system uses RTL flow, then trace the popup positioning path. Done means an app-window-anchored popup with matching app dimensions covers the app window instead of being shifted left.