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Sometimes the autocomplete is not closed when closing the dialog component. We can replicate the reported issue by following the steps given in the video link.
Issue reproducing sample link: https://www.syncfusion.com/downloads/support/common/508/ze/BlazorServer_7a626f52.zip
Please refer the below video for replicating the issue.
Video link: https://www.syncfusion.com/downloads/support/directtrac/general/ze/typeahed_1n5d5ji-328395873