How to reproduce:

1. Open HUB;
2. Create 3D(HDRP) project;
3. Create visual effect graph in the "Project" window  (Create->Visual Effects-> Visual Effect Graph);
4. Drag it to the "Scene" window;
5. Select newly created graph in the "Project" window and go to "Inspector" window;
6. Click "Open" button;
7. In the opened graph window turn on "Blackboard";
8. Click "+" in it and select "Category";
9. Verify, that category becomes created;
10. Rename that category to "AAA;
11. Make duplicate of the newly created and renamed category;
12. Verify that duplicated category is named "AAA 1";
13. Select first category, which was duplicated, and try to rename it to "AAA 1".

Expected result: User should get a validation message, which would inform him that such title already exists and user would be forced to enter a new unused title at that step.
Actual result: Console displays error. Image added in the attachments section.

Reproducible with: 10.10.0 (2020.3.41f1), 12.1.7 (2021.3.12f1), 13.1.8 (2022.1.21f1),  14.0.3 (2022.2.0b12),  15.0.1 (2023.1.0a15).