Steps to reproduce:
1. Create a new project using the Universal 3D Template
2. Open Window > Package Manager > Shader Graph > Samples and import "Feature Examples"
3. In the Project window, select Assets/Samples/Shader Graph/<ver>/Feature Examples/Custom Lighting/CustomLightingPBR.shadergraph
4. Observe the Inspector window

Actual results: "'GlossyEnvironmentReflection': implicit truncation of vector type" warning is shown in the Inspector window

Expected results: Shader samples compile without warnings

Reproducible with versions: 6000.0.84f1, 6000.3.25f1, 6000.6.4f1, 6000.7.0b3, 7000.0.0a5

Tested on (OS): Windows 11 Pro (26200), macOS 27 (Apple Silicon)

'GlossyEnvironmentReflection': implicit truncation of vector type
Compiling Subshader: 0, Pass: Unlit, Vertex program with MATERIAL_QUALITY_HIGH
Platform defines: SHADER_API_DESKTOP UNITY_ENABLE_DETAIL_NORMALMAP UNITY_ENABLE_REFLECTION_BUFFERS UNITY_FRAMEBUFFER_FETCH_AVAILABLE UNITY_LIGHTMAP_FULL_HDR UNITY_LIGHT_PROBE_PROXY_VOLUME UNITY_NEEDS_RENDERPASS_FBFETCH_FALLBACK UNITY_PBS_USE_BRDF1 UNITY_SPECCUBE_BLENDING UNITY_SPECCUBE_BOX_PROJECTION UNITY_USE_DITHER_MASK_FOR_ALPHABLENDED_SHADOWS
Disabled keywords: DIRLIGHTMAP_COMBINED DOTS_INSTANCING_ON FOG_EXP FOG_EXP2 FOG_LINEAR INSTANCING_ON LIGHTMAP_BICUBIC_SAMPLING LIGHTMAP_ON MATERIAL_QUALITY_LOW MATERIAL_QUALITY_MEDIUM SHADER_API_GLES30 SHADER_API_GLES31 SHADER_API_GLES32 UNITY_ASTC_NORMALMAP_ENCODING UNITY_COLORSPACE_GAMMA UNITY_HARDWARE_TIER1 UNITY_HARDWARE_TIER2 UNITY_HARDWARE_TIER3 UNITY_LIGHTMAP_DLDR_ENCODING UNITY_LIGHTMAP_RGBM_ENCODING UNITY_METAL_SHADOWS_USE_POINT_FILTERING UNITY_NO_DXT5nm UNITY_NO_SCREENSPACE_SHADOWS UNITY_PBS_USE_BRDF2 UNITY_PBS_USE_BRDF3 UNITY_PRETRANSFORM_TO_DISPLAY_ORIENTATION UNITY_UNIFIED_SHADER_PRECISION_MODEL UNITY_VIRTUAL_TEXTURING USE_LEGACY_LIGHTMAPS