Steps to reproduce:

1) Download attached project ' LightingTest_Rupert.zip' and open in Unity
2) Open scene 'ReferenceGameScene'
3) Switch Platform to Android
4) Click on 'Generate Lighting' and wait until lighting will be generated
---Check shadow on the floor(see attached image 'ManuallyBaked.png')
No falloff from the shadow
5) Switch Platform to PC/Mac & Linux Standalone
6) Click on 'Generate Lighting' and wait until lighting will be generated
---Check shadow on the floor(see attached image 'ManuallyGenerated.png')
There will be a small falloff from the shadow
7) Enable Auto Generate and wait until lighting will be generated
Note: In Android and Standalone shadow falloff will be smooth and same(Check attached image 'AutoGenerated.png')

Expected result: Manually generated lighting should generate same result as Auto Generated lighting and there should be no big difference between platforms
Actual result: There is a shadow falloff difference between manually generated lighting on different platforms

-----Workaround: Enable Auto Generate in Lighting window

This new Lighting Generate feature started from 5.6.0b2

Reproduced with:
5.6.0b2, 5.6.0b5, 5.6.0b7