kendo time picker not setting ng-model when "10:0" like data entered

Question

ng-model is not updating with value when entering "10:0" (not full time, but time picker automatically full fills it). ng-model is set undefined.

 <input kendo-time-picker 
        class="kendo-block" 
        k-format="'HH:mm'" 
        placeholder="Start Time" 
        required 
        k-ng-model="SP.booking.pickupStartTimeF" 
        name="pickupStartTime" 
        pattern="^([0-1][0-9]|2[0-3]):([0-1][0-9]|2[0-3])$" 
        validationmessage="Enter time format" />