System.InvalidOperationException error is thrown while compiling expression graph on adding Node to Sub Mesh Mask in Static Mesh.

Steps to repro:
1. Create a new project.
2. Windows > Package Manager > Visual Effects Graph > Install.
3. Packages > Visual Effect Graph > Editor > Templates > Open Simple Static Mesh.
4. Add Node to Sub Mesh Mask by dragging from the input node.
5. Operator > Attribute > Age over LifeTime.

Actual Result:
Error is thrown in the console.

Expected Result:
No Error in the console.

Reproducible in:
2019.3.0a12, 2019.3.0a10.

NOTE:
1. Visual Effects is introduced in 2019.3.0a10.
2. Could not test on Mac due to https://fogbugz.unity3d.com/f/cases/1174796/

Environment:
Only on Windows.

Stack trace:
Simple Static Mesh : Exception while compiling expression graph: System.InvalidOperationException: Expression for slot subMeshMask must be evaluable on CPU: UnityEditor.VFX.VFXExpressionCastFloatToUint
at UnityEditor.VFX.VFXStaticMeshOutput.GetExpressionMapper (UnityEditor.VFX.VFXDeviceTarget target) [0x000dc] in F:\Suresh\New Unity Project (9)\Library\PackageCache\com.unity.visualeffectgraph@7.0.1\Editor\Models\Contexts\Implementations\VFXStaticMeshOutput.cs:167
at UnityEditor.VFX.VFXData.CollectAttributes () [0x002ac] in F:\Suresh\New Unity Project (9)\Library\PackageCache\com.unity.visualeffectgraph@7.0.1\Editor\Data\VFXData.cs:322
at UnityEditor.VFX.VFXGraphCompiledData.Compile (UnityEditor.VFX.VFXCompilationMode compilationMode, System.Boolean forceShaderValidation) [0x001c8] in F:\Suresh\New Unity Project (9)\Library\PackageCache\com.unity.visualeffectgraph@7.0.1\Editor\Compiler\VFXGraphCompiledData.cs:814 : at UnityEditor.VFX.VFXStaticMeshOutput.GetExpressionMapper (UnityEditor.VFX.VFXDeviceTarget target) [0x000dc] in F:\Suresh\New Unity Project (9)\Library\PackageCache\com.unity.visualeffectgraph@7.0.1\Editor\Models\Contexts\Implementations\VFXStaticMeshOutput.cs:167
at UnityEditor.VFX.VFXData.CollectAttributes () [0x002ac] in F:\Suresh\New Unity Project (9)\Library\PackageCache\com.unity.visualeffectgraph@7.0.1\Editor\Data\VFXData.cs:322
at UnityEditor.VFX.VFXGraphCompiledData.Compile (UnityEditor.VFX.VFXCompilationMode compilationMode, System.Boolean forceShaderValidation) [0x001c8] in F:\Suresh\New Unity Project (9)\Library\PackageCache\com.unity.visualeffectgraph@7.0.1\Editor\Compiler\VFXGraphCompiledData.cs:814
UnityEditor.EditorApplication:Internal_CallUpdateFunctions()[Visual Effect Graph] System.InvalidOperationException error is thrown on adding Node to Sub Mesh Mask in Static Mesh.