"Shader error in 'Sub Graphs/Master..." error when selecting invalid slot types for Sub Graph Output node

Steps to reproduce:

1. Create a new Unity project using a 3D Universal Template
2. Create and open a Sub Graph (Assets > Create > Shader Graph > Sub Graph)
3. Select the Output node
4. In the Graph Inspector, switch to the Node Settings tab
5. Select the dropdown next to "Out_Vector4"
6. Choose "Texture 2D", "Texture 2D Array", "Texture 3D", "Cubemap" or "Gradient" (all produce the error)
7. Observe the Console

Actual results: "Shader error in 'Sub Graphs/Master': cannot convert from 'int' to 'struct SurfaceDescription' at line 174 (on d3d11)" error is shown

Expected results: Invalid selection options should be greyed out and not selectable

Reproducible with versions: 2023.1.0b1, 6000.0.65f1, 6000.3.3f1, 6000.4.0b3, 6000.5.0a4

Tested on (OS): Windows 11, macOS 26.1 (M1 Pro)

Notes:

• The same error then still gets shown randomly, even after the SubGraph is deleted