Steps to reproduce:

1. Open attached project
2. Notice that 'Default Orientation' is set to 'Auto Rotation' with only 'LandscapeLeft' as allowed orientation in Player settings
3. Plug-in a device with Unity Remote 4 installed
4. Connect this device to Editor (Edit/Project Settings/Editor/Device)
5. Open Unity Remote 4
6. While holding the device in LandscapeLeft, play 'Test' scene in editor
7. Notice everything looks good so far
8. Rotate the device to LandscapeRight

Expected result: Remote application should stay in LandscapeLeft orientation, as that is the only one allowed.

Actual result: The app on device rotates to LandscapeRight, and if you try to rotate it back to LandscapeLeft, it will not work - remote app stays in LandscapeRight.

Notes:
Same happens if you repeat steps with LandscapeRight as a default orientation and rotate it to Left once it's launched.
Portrait and PortraitUpsideDown do not exhibit this issue.
When deployed to device, the application works as expected.

Workaround: Instead of setting 'Auto Rotation' with only 'LandscapeLeft' as allowed orientation, simply change the 'Default Orientation' setting to 'LandscapeLeft' - then everything works as expected.