OS drag and drop animation acts as rejected when dropping a Shader Sub Graph into the Shader Graph even though it is added

How to reproduce:
1. Open the attached "ShaderGraph" project
2. Open the "Test" Shader Graph
3. From the Project window, drag and drop "Sub-Graph" into the "Test" Shader Graph
4. Observe the system animation

Expected results: The system animation (the black text with the file's name) disappears once the "Sub-Graph" is added to the Shader Graph
Actual results: The system animation goes back to the Project window which is a rejected behaviour even though the "SubGraph" was successfully added

Reproducible with: 6000.0.71f1, 6000.3.12f1, 6000.4.2f1, 6000.5.0b2, 6000.6.0a3

Reproducible on: macOS Tahoe 26 (M1)
Not reproducible on: No other environment tested