How to reproduce:
1 Open the attached '1312779.zip' project
2. In the Project window double-click on the 'Test' Graph
3. In the Blackboard select the Boolean Keyword
4. In the Graph Inspector select the Node Settings tab
5. Observe the Graph Inspector

Expected result: The 'Exposed' checkbox is displayed
Actual result: The 'Exposed' checkbox is not displayed

Reproducible with: Shader Graph 10.2.0 (2020.2.0b12), 10.3.1 (2020.2.4f1), 11.0.0 (2021.1.0b6), 12.0.0 (2021.2.0a4)
Not reprudicible with: Shader Graph 10.1.0 (2020.2.0b12)
Cannot test with: Shader Graph 10.1.0, 10.2.0 (2018.4.31f1, 2019.4.20f1, 2020.2.4f1, 2021.1.0b6, 2021.1.0a4) (the package versions are not supported)

Notes:
- The issue is reproducible with Keywords and Properties