To reproduce:

1.Download and open "TestVulkan.zip" project.
2.Open Player Settings and set "Disable Depth and Stencil" option to true.
3.Build and run the project on a device.

Expected result: Cube is rendered and seen in the built application.
Actual result: Cube is not rendered in the built application.

Reproduced with: 5.4.5p1, 5.5.3p1, 5.6.0p2, 2017.0.1b1.

DUT:

Samsung SM G925F (Galaxy S6 Edge), OS:6.0.1, CPU:arm64-v8a, GPU:Mali-T760, Build:samsung/zeroltexx/zerolte:6.0.1/MMB29K/G925FXXU5DQA7:user/release-keys

Google Pixel, OS:7.1.2, CPU:arm64-v8a, GPU:Adreno (TM) 530, Build:google/sailfish/sailfish:7.1.2/N2G47E/3766409:user/release-keys

Google Nexus 7, OS:5.1.1, CPU:armeabi-v7a, GPU:NVIDIA Tegra 3, Build:google/nakasi/grouper:5.1.1/LMY47V/1836172:user/release-keys

Notes: Works fine when clear flags are set to any other option.