To reproduce:
1. Open attached project
2. In the project settings, make sure that Vulkan is set for graphics API ( not OpenGLES3)
3. Build and run to the android
4. Notice that the sphere is red

Actual result: Tessellation doesn't work and the sphere is red.
Expected result: The sphere should be green

Reproduced with: 2018.3.0f2; 2018.3.2f1; 2019.1.0a14; 2019.2.0a1
Can't repro on 2018.2 and 2017.4 because of errors.

Note: error when compiling shader with Vulkan
'location' : SPIR-V requires location for user input/output
Compiling Vertex program with UNITY_PASS_FORWARDBASE DIRECTIONAL
Platform defines: UNITY_NO_DXT5nm UNITY_NO_RGBM UNITY_ENABLE_REFLECTION_BUFFERS UNITY_NO_CUBEMAP_ARRAY UNITY_NO_SCREENSPACE_SHADOWS UNITY_PBS_USE_BRDF2 SHADER_API_MOBILE UNITY_HARDWARE_TIER2 UNITY_COLORSPACE_GAMMA UNITY_LIGHTMAP_DLDR_ENCODING

Reproduced with:
VLNQA00217, Razer Phone 2 (Phone 2), Android 8.1.0, CPU: Snapdragon 845 SDM845, GPU: Adreno (TM) 630
VLNQA00224, Samsung Galaxy A5(2017) (SM-A520F), Android 8.0.0, CPU: Exynos 7 Octa 7880, GPU: Mali-T830
VLNQA00138, Huawei P20 Pro (CLT-L29), Android 8.1.0, CPU: HiSilicon Kirin 970, GPU: Mali-G72

Can't reproduce with:
VLNQA00017, Huawei Nexus 6P (Nexus 6P), Android 8.0.0, CPU: Snapdragon 810 MSM8994, GPU: Adreno (TM) 430
VLNQA00078, Motorola Nexus 6 (Nexus 6), Android 7.1.1, CPU: Snapdragon 805 APQ8084AB, GPU: Adreno (TM) 420