Shader Graph Blackboard categories are shown in the Inspector even when all of their properties and keywords are not exposed

Reproduction steps:
1. Open the attached “IN-48414_Shader Graph Blackboard unexposed properties.zip” project
2. Select the “ShadowMaterial.mat” in the Materials folder
3. Observe the “Surface Inputs” settings in the Inspector

Expected result: Categories from the Blackboard of the “ShadowMaterial” Shader Graph with no exposed properties or keywords are hidden in the Inspector
Actual result: Categories from the Blackboard of the “ShadowMaterial” Shader Graph with no exposed properties or keywords are shown in the Inspector

Reproducible with: 12.1.12 (2021.3.29f1), 14.0.8 (2022.3.6f1), 15.0.6 (2023.1.7f1), 16.0.3 (2023.2.0b3)

Reproduced on: Windows 11 Pro