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In Cascading DropDownLists, if the selected value on main dropdown change for the second time, the child dropdown show the new values but can't be selected.

Replication procedure

1.Run the sample: 


2. Select the parent dropdown value

3. Then, select the fist child dropdown value.

4. Again modify the parent drodpown value

5.Choose the first child drodpown value

Actual output: Child dropdown shows the values, but can't be selected.

Expected output: All child's dropdown value should be selected