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I created a Blazor Wasm app using the Syncfusion Blazor Template Studio. I added a single Diagram  component.
I did not have this problem in v17.4.0.46

Build and run.
Click on the Diagram nav link.

My setup
Visual Studio: Version 16.6.0 Preview 2.1
Dotnet: 3.1.300-preview-015048 (I also tried 3.1.200, 3.1.201)
Blazor: 3.2.0-preview3.20168.3 (I also rolled back to preview 2)

The zip file contains
1. Screen capture of the browser timing window
2. The browser consloe log
3. The app project.