Bug report

Regression introduced in R1 2020 SP1. Related to #5400

Reproduction of the problem

Dojo example.

1. Open the browser's dev tools Network tab.
2. Run the example.
3. Type in "s" in the ComboBox. A request is sent and the popup displays matching items (expected).
4. Press Backspace key to clear the ComboBox input.

Current behavior

2 requests are sent to the "read" end point.

Expected/desired behavior

1 request is sent to the "read" end point. Note that if the input is cleared with the "clear" button, it works as expected and only 1 request is sent.

Environment

• Kendo UI version: 2021.1.119
• jQuery version: x.y
• Browser: [all]