Steps to reproduce:
1) Download attached project and open in Unity
2) Add URP 9.0.0 package from here:
https://github.com/Unity-Technologies/ScriptableRenderPipeline
3) Build and Run Sample scene on a device
Observe:
'Paint1G_WAnim_Shader' shader on the bucked will fail to compile (check attached images)

Reproduced with:
2020.2.0a5 URP: 9.0.0.preview5

Not reproduced with:
2020.2.0a5 URP: 8.0.1

Regression since URP 9.0.0

Devices under testing:
Reproduced with:
VLNQA00108, LG Leon 4G LTE, CPU: Snapdragon 410 MSM8916, GPU: Adreno 306, OS: 5.0.1
VLNQA00310 iPad Pro 12.9 (iOS 11.2.1)

Not reproduced with:
iPhone 7 (iOS 12.3.1)
VLNQA00217, Razer2, CPU: Snapdragon 845 SDM845, GPU: Adreno630, OS: 9.0.0
VLNQA00268, Galaxy S10+, CPU: Exynos 9 9820, GPU: Mali-G76, OS: 9.0.0
VLNQA00010, Galaxy S8, CPU Snapdragon 835 MSM8998, GPU: Adreno 540, OS: 7.0.0
VLNQA00093, Galaxy S6 Edge, CPU Exynos 7 Octa 7420, GPU Mali-T760
VLNQA00270, Samsung Galaxy S10e, CPU: Exynos 9 9820, GPU: Mali-G76

Not Reproduced using Gles2 and Vulkan Graphics APIs

Note: This shader fails to compile:
Unsupported: 'Paint1G_WAnim_Shader' - All passes removed