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Sample : https://www.syncfusion.com/downloads/support/directtrac/general/ze/BlazorApp4720602877
When using the ComboBox with virtualization and scrolling, it skips a few elements. The issue only occurs when using itemTemplate, and before version 21.1.35, the virtualization does not work with item templates.

Replication procedure :
1. Run the Sample.
2. Open the popup and scroll down.
Expected Output: While scrolling, it does not skip any elements
Current Output: While scrolling, it skips a few elements.