Reproduction steps:
1. Create a new project
2. Drag and drop the attached “MySimpleGraph.cs” file to the Assets folder
3. Create > Graph Toolkit Samples > Simple Graph
4. Double-click on the newly created Graph Asset to open Graph window
5. Press MiniMap button to enable MiniMap overlay
6. Observe Zoom value
Actual result: “NaN” value is displayed
Expected result: “100%” value is displayed
Reproducible with: 6000.3.12f1, 6000.4.1f1, 6000.5.0b1, 6000.6.0a1
Reproduced on: Windows 11, macOS Sequoia 26.2 (M4)
Note: Issue is resolved by zooming in or out in the Graph window