How to reproduce:
1. Open the attached "New Unity Project.zip" project
2. Open the "SampleScene" Scene
3. Enter the PlayMode

Expected result: R16G16B16A16_SNorm Texture array is created successfully
Actual result: Creating R16G16B16A16_SNorm Texture array results in an error

Reproducible with: 2019.4.2f1, 2020.1.0b14, 2020.2.0a16

Full error:
Texture creation failed. 'R16G16B16A16_SNorm' is not supported for Sample usage on this platform. Use 'SystemInfo.IsFormatSupported' C# API to check format support.
UnityEngine.Texture2DArray:.ctor (int,int,int,UnityEngine.Experimental.Rendering.GraphicsFormat,UnityEngine.Experimental.Rendering.TextureCreationFlags,int)
Test:Start ()

Notes:
Could not test in 2018 because of Argument errors