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I found that the problem is in using sfdropdownlist inside the datagrid, no matter where - in the filter, in the toolbar
JPJeevakanth Palaniappan Syncfusion Team August 31, 2020 04:05 PM UTC
Hi Ivan,
Greetings from Syncfusion support.
We have validated your query and confirmed “Spinner is loading infinitely when the grid and dropdown is rendered” as a bug and logged a defect report for the same and we will include the defect fix in our upcoming 2020 Volume 3 Main Release.
You can now track the current status of your request, review the proposed resolution timeline, and contact us for any further inquiries through below links