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After changed the new datasource, through change event, preseelcted values is not updated in input, but updated in popup.
In input, it has been updating only when selecting the value of the new datasource item in the popup.
Replication procedure:
1.Run the below sample:
https://www.syncfusion.com/downloads/support/directtrac/general/ze/Multiselect-1567546460
2. Open the popup
3. Choose the value from the popup
4.Expected output: