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igCombo shows no matches found after selected an item in dropdown

I use IgCombo version 2019.2. Datasource is from .net Web api. Since we have millions records, the API only returns data after a user input some characters. The search result lists in the dropdown OK. After a item is selected, the dropdown list is gone, igCombo dropsown shows no matches found. 

Please let me know how to resolve the issue, or a better solution for very larger data source.

Thank you!