Steps to reproduce:

1) Download attached project 'SplashScreenProblem.zip' and open in Unity
2) Build and run project on a device
3) Lock device after launch
4) Unlock device after ~2s
Note: Check attached gif 'SplshScrnIssue.gif' to see 3rd and 4th steps of reproduction and actual result
You will see Unity logo will not show up on a splash screen

Note: Issue appears when using splash custom image and splash screen together

Expected result: Unity logo will be rendered without any issue in splash screen after device been unlocked (check attached gif 'expected.gif')
Actual result: Unity logo does not show up in splash screen, blank cube is rendered instead

Not reproduced with:
5.5.3p1, 5.6.0b2

Reproduced with:
5.6.0p2, 2017.1.0b1

Regression from: 5.6.0b3

DUT:
Verizon SM G930V (Galaxy S7 Verizon), OS:7.0, CPU:arm64-v8a, GPU:Adreno (TM) 530, Build:Verizon/heroqltevzw/heroqltevzw:7.0/NRD90M/G930VVRU4BQA2:user/release-keys

Xiaomi MI MAX, OS:6.0.1, CPU:arm64-v8a, GPU:Adreno (TM) 510, Build:Xiaomi/hydrogen/hydrogen:6.0.1/MMB29M/V7.5.1.0.MBCCNDE:user/release-keys

HUAWEI EVA L19, OS:7.0, CPU:arm64-v8a, GPU:Mali-T880, Build:HUAWEI/EVA-L19/HWEVA:6.0/HUAWEIEVA-L19/C432B182:user/release-keys