converting from boostrap-select: encountering several issues...

[dss010101]

I am attempting to convert to this library from bootstrap-select, but, I am running into several issues with this widget:

1. closeAfterSelect does not seem to work
2. nav keys do not work in the input area. when closed nothing happens. When opened, even though cursor is in input area, the nav keys navigate the dropped down list.
3. Unable to select all or cut text in the input area (i.e. CTRL + A) does not work.
4. should the control automatically select an option list where 'selected=true'?
5. onChange seems to fire each time you type a character, as opposed to when the selection actually changes.

Below is the version and how im populating the base html elements (note i am setting a 'Selected' attribute of one of the option items, but this does not actually work after i initialize the control/widget:

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/selectize.js/0.15.2/css/selectize.bootstrap5.min.css" integrity="sha512-Ars0BmSwpsUJnWMw+KoUKGKunT7+T8NGK0ORRKj+HT8naZzLSIQoOSIIM3oyaJljgLxFi0xImI5oZkAWEFARSA==" crossorigin="anonymous" referrerpolicy="no-referrer" />
  <script src="https://cdnjs.cloudflare.com/ajax/libs/selectize.js/0.15.2/js/selectize.min.js" integrity="sha512-IOebNkvA/HZjMM7MxL0NYeLYEalloZ8ckak+NDtOViP7oiYzG5vn6WVXyrJDiJPhl4yRdmNAG49iuLmhkUdVsQ==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>

<select id="contract" name="contract" class="selectpicker form-control" data-live-search="true" alt="" >
<option>Select Contract</option>;
{% for n in contract_lst %}
	<option value="{{n.contract_code}}" {% if resp_data.contract_code==n.contract_code %} selected {% endif %}>{{n.contract_name}}</option>';    
{% endfor %}
</select>

This is how i am initializing:

$('#coontract').selectize({ 
	sortField: 'text',
	closeAfterSelect: true,
	allowEmptyOption: true,                
	onChange: function(value){ fetchChartOnChange(); }
});          

Any help resolving these issues would be appreciated.