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When the AllowCustom is false, the entered custom value should removed from the input. But its maintained In the input. Its working fine up to the 18.4.0.46 version
@using Syncfusion.Blazor.DropDowns
<SfComboBox CssClass="custom" TItem="string" TValue="string" Placeholder="Please Select..." AllowCustom="false" DataSource="@(new string[] { "Item 1", "Item 2", "Item 3"})">
</SfComboBox>
Issue reproducing sample: https://www.syncfusion.com/downloads/support/directtrac/general/ze/CustomValue_Issue1380699183