How to reproduce:
1. Create and open a new project using a URP template
2. In the Project tab, right-click and select “Create → Shader Graph → URP → Unlit Shader Graph”
3. Double-click on the newly created file to open the ShaderGraph window
4. Right-click anywhere in the ShaderGraph window
5. Select “Create Node”
6. Double-click to add any node (for example, “Math → Basic → Multiply”)
7. Observe the result

Expected result: Only the node that was selected in step 6 is created
Actual result: An “Add” node, in addition to the node selected in step 6 is created

Reproducible in: 6000.0.0b11, 6000.0.24f1
Not reproducible in: 2021.3.45f1, 2022.3.51f1, 6000.0.0b10

Reproducible on: Windows 11
Not reproducible on: No other environments tested

Notes:

* Not reproduced by CQA
* An “Add” node is also created when double-clicking the window header to maximize the window