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[UIR] Importing Built-in shaders breaks PackageManager GUI rendering when using RP

UI Toolkit


Steps to reproduce:
1. Open a new project with any RP installed
2. Import user-supplied built-in shaders
3. Open Package Manager

Expected: GUI is rendered
Actual: GUI is not rendered

Reproduced in: 2019.3.3f1, 2020.1.0a25
Not reproduced in: 2019.2.21f1 (no URP), 2018.4( no URP)

Note: no repro with LWRP

URP versions: 7.1.8, 7.2.0
HDRP versions: 7.2.0

  1. Resolution Note (2020.2.X):

    The version of the built-in shaders must correspond to the version of Unity in use. In this case, the built-in shaders of 2019.2.10f1 are being imported in a project opened with 2019.3.1f1. This is not supported nor recommended. This causes UIToolkit to use an older incompatible version of Internal-UIRAtlasBlitCopy.shader. Deleting the shader from the Assets directory works around this specific issue, but there may be other lingering issues.

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