Blackboard: "+" is not centred in the button

How to reproduce:

1. Open HUB;
2. Create 3D(HDRP) project;
3. Create a visual effect graph in the "Project" window  (Create->Visual Effects-> Visual Effect Graph);
4. Select "Minimal System" in "Create New VFX Asset" and click "Create";
5. Double-click on the graph to open it;
6. Hover on the "+" in the blackboard

Actual Result: "+" is not centered on the button. The screenshot is added in the attachments section.

Expected Result: "+" should be centered. The icon should be used.

Reproducible with: 2021.3.31f1, 2022.3.10f1, 2023.1.16f1, 2023.2.0b13, 2023.3.0a9.