Unable to add UI only from aggregate model to table and field is duplicated in add fields list

After adding a UI only field to an aggregate model, when choosing "Add Fields" on a table, three issues occur:

1) The UI Only field appears twice in the list
2) The UI only field "fieldId" column indicates "undefined"
3) No checkbox appears next to the field so you are unable to add it to the table

Note - You are able to drag the field from the model itself on to the table

Steps to reproduce:
1) Create page from XML below (the XML is based on https://bitbucket.org/skuid/samplepages/src/1e02bf5a392e141442b992e270ce593345faa979/pages/Opportuni... with the only difference being that a UI only field "FriendlyText" was added)
2) Click on "Add Fields"

Expected Behavior
FriendlyText appears once, has a FieldId and is "selectable" 

Actual Behavior
1) Appears twice
2) No fieldid
3) Can't select

Thanks!

Sample Page XML

<skuidpage showsidebar="true" showheader="true" unsavedchangeswarning="" personalizationmode="server">   <resources>
      <labels/>
      <javascript/>
      <css/>
   </resources>
   <models>
      <model id="Opportunity" limit="100" query="true" createrowifnonefound="false" orderby="" sobject="Opportunity" type="aggregate" adapter="">
         <fields>
            <field id="Amount" name="sumAmount" function="SUM"/>
            <field id="Amount" name="avgAmount" function="AVG"/>
         <field id="FriendlyText" uionly="true" displaytype="TEXT" label="Friendly Text"/>
</fields>
         <conditions>
            <condition type="fieldvalue" value="" enclosevalueinquotes="false" field="CloseDate" operator="=" state="filterableoff" inactive="true" name="CloseDate"/>
            <condition type="fieldvalue" value="" enclosevalueinquotes="true" field="OwnerId" state="filterableoff" inactive="true" name="OwnerId"/>
            <condition type="fieldvalue" value="" enclosevalueinquotes="true" field="Account.Industry" state="filterableoff" inactive="true" name="Account.Industry"/>
            <condition type="userinfo" value="" field="OwnerId" operator="=" enclosevalueinquotes="true" userinfotype="userid" state="filterableoff" inactive="true" name="OwnerId_ME"/>
            <condition type="fieldvalue" value="" enclosevalueinquotes="true" field="StageName" state="filterableoff" inactive="true" name="StageName"/>
         </conditions>
         <groupby method="simple">
            <field id="StageName" name="stageName"/>
         </groupby>
      <actions/>
</model>
      <model id="OppOwners" limit="100" query="true" createrowifnonefound="false" orderby="LastModifiedDate DESC" sobject="User">
         <fields>
            <field id="Name"/>
            <field id="Id"/>
         </fields>
         <conditions>
            <condition type="userinfo" value="" field="Id" operator="!=" enclosevalueinquotes="true" userinfotype="userid"/>
         </conditions>
      <actions/>
</model>
   </models>
   <components>
      <pagetitle model="Opportunity" uniqueid="sk-2m1itv-66">
         <maintitle>Opportunities by Stage</maintitle>
         <actions/>
         <subtitle>Report</subtitle>
      </pagetitle>
      <skootable showconditions="true" showsavecancel="false" searchmethod="server" searchbox="true" showexportbuttons="false" pagesize="10" createrecords="false" model="Opportunity" mode="readonly" uniqueid="sk-2m1itv-67">
         <fields>
            <field id="StageName" name="stageName"/>
            <field id="Amount" name="sumAmount" columnwidth="AVG">
               <summaries>
                  <summary>sum</summary>
               </summaries>
               <label>SUM</label>
            </field>
            <field id="Amount" name="avgAmount"/>
         </fields>
         <rowactions/>
         <massactions usefirstitemasdefault="true"/>
         <views>
            <view type="standard"/>
         </views>
         <filters>
            <filter type="select" filteroffoptionlabel="Any Close Date" createfilteroffoption="true" condition="CloseDate">
               <sources>
                  <source type="manual">
                     <options>
                        <option label="Closed: Last Year" type="simple" value="LAST_YEAR"/>
                        <option label="Closing: This Year" type="simple" value="THIS_YEAR"/>
                        <option label="Closing: Next 30 Days" type="simple" value="NEXT_N_DAYS:30"/>
                        <option label="Closing: Next 90 Days" type="simple" value="NEXT_N_DAYS:90"/>
                        <option label="Closing: This Fiscal Quarter" type="simple" value="THIS_FISCAL_QUARTER"/>
                     </options>
                  </source>
               </sources>
            </filter>
            <filter type="select" filteroffoptionlabel="Any Owner" createfilteroffoption="true" condition="OwnerId" label="Owner">
               <sources>
                  <source type="model" model="OppOwners">
                     <valuetemplate>{{Id}}</valuetemplate>
                     <labeltemplate>Owner: {{Name}}</labeltemplate>
                  </source>
                  <source type="manual" model="Opportunity">
                     <options>
                        <option label="My Opportunities" type="complex">
                           <effects>
                              <effect action="activate" value="" condition="OwnerId_ME"/>
                           </effects>
                        </option>
                     </options>
                  </source>
               </sources>
            </filter>
            <filter type="select" filteroffoptionlabel="Any Industry" createfilteroffoption="true" condition="Account.Industry">
               <sources>
                  <source type="metadata" prefix="Industry: "/>
               </sources>
            </filter>
            <filter type="select" filteroffoptionlabel="Any Stage" createfilteroffoption="true" condition="StageName">
               <sources>
                  <source type="metadata"/>
               </sources>
            </filter>
         </filters>
      </skootable>
   </components>
<styles>
<styleitem type="background" bgtype="none"/>
</styles>
</skuidpage>