Select2 "No Matches found" on XPAGES partial update - xpages

Question

I have downloaded Demos.nsf and try to learn select2 from http://www.bootstrap4xpages.com/bs4xp/demos.nsf/select2.xsp
Everything run well but I have found a problem select2 didn't trigger XPAGES server side event when return "No Matches found"
Here how to produce this problem :
I have input hidden and computed text that binding with document datasource
I have another button to partial update to that computed text
That input hidden used for select2 with scriptBlock
Run that xpages
Type name (e.g. patrick) and select that name
Click that button and computed text will display like selected name
Type keyword like "qqqqqqq" and select2 will results "No Matches Found"
Click that button again, and computed text will be "blank"
Redo number 6 dan 7 again, and computed text still be "blank" and didn't display "Patrick" name
How to solve this problem ?
Here my code :
<xp:inputHidden id="inputHidden1" value="#{document1.coba}"/>
<xp:scriptBlock id="scriptBlock4">
<xp:this.value><![CDATA[
x$( "#{id:inputHidden1}" ).select2({
placeholder: "Find someone",
minimumInputLength: 2,
quietMillis: 300,
width: '300px',
allowClear : true,
ajax: {
url: "namesDataStore.xsp",
dataType: 'json',
data: function (term, page) {
return {
q: term, // search term
page_limit: 10
};
},
results: function (data, page) { // parse the results into the format expected by Select2.
return data;
}
},
initSelection: function(element, callback) {
//sets a default value (if a value was selected previously)
var id = $(element).val();
//if a value was selected: perform an Ajax call to retrieve the text label
if (id !== "") {
$.ajax(
"namesDataStore.xsp", {
data: {
id: id
},
dataType: "json"
}).done(function(data) { callback(data); });
}
}
});
]]></xp:this.value>
</xp:scriptBlock>
<xp:text escape="true" id="computedField1"
value="#{document1.coba}">
</xp:text>
<xp:button value="Refresh"
id="button2" styleClass="btn btn-success">
<i class="glyphicon glyphicon-ok " />
<xp:eventHandler event="onclick" submit="true"
refreshMode="partial" refreshId="computedField1">
</xp:eventHandler>
</xp:button>