Steps to reproduce:
1. Open the attached project "Case_1184461"
2. Notice the error in the console

Expected results: No errors displayed in the console
Actual results: Error "GUID [9802e36ef1c38064d9bcd7bf2e01cccb] for asset 'Packages/com.unity.render-pipelines.lightweight/ShaderLibrary/Deprecated.hlsl' conflicts with:
'Packages/com.unity.render-pipelines.universal/ShaderLibrary/Deprecated.hlsl' (current owner)
We can't assign a new GUID because the asset is in an immutable folder. The asset will be ignored." is thrown when LWRP is imported

Reproducible with: 2019.3.0b2(7.0.1), 2019.3.0b3(7.0.1), 2020.1.0a3
Not Reproducible with: 2019.2.4f1(6.9.1), 2019.3.0b1(7.0.1)

Note: Due to the error the project Building is not allowed