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When the toast is shown, the element already has the class "e-blazor-toast-hidden" causing the toast to not be displayed. This can be reproduced by simply upgrading the nuget packages on the ToastSample project found at:
https://github.com/SyncfusionExamples/Blazor-Getting-Started-Examples.git
I've attached the ToastSample project already upgraded to 20.1.0.52