Does dapper split XML data into a list of strings?

One of the things I've been using dapper for is to convert XML data coming from our database into strings and then deserializing it within the given object the way I need it.

I came across something today where dapper returned a list of strings containing the XML only it was split up. Is this intended? Should I be coding around this if I'm expecting a single string of xml to be returned?

Here's how I'm calling the proc and if you execute the proc, it returns a single result containing XML data, but dapper is returning 2 strings in the result. If I concatenate them, then I get back what I'm expecting, but this doesn't seem like it's something I should have to concatenate.

var result = conn.Query<string>(procName, parameters, commandType: CommandType.StoredProcedure);

EDIT: Per comment request, here is the stored procedure and example data that is being returned. This only occurs once the XML data reaches a certain size. Smaller batches of XML data do not cause this to happen. The example provided here should be enough data to trigger it to happen.

usp_ListAllGroups

SELECT
   (SELECT ClassificationItemID AS '@ID', GroupCN AS '*' 
      FROM UserGroup WITH (NOEXPAND)
       FOR XML PATH('Group'), TYPE)
   FOR XML PATH('Groups');

Result XML

<Groups>
  <Group ID="4">SomeGroupName</Group>
  <Group ID="9">SomeGroupName</Group>
  <Group ID="2">SomeGroupName</Group>
  <Group ID="553">SomeGroupName</Group>
  <Group ID="447">SomeGroupName</Group>
  <Group ID="435">SomeGroupName</Group>
  <Group ID="395">SomeGroupName</Group>
  <Group ID="489">SomeGroupName</Group>
  <Group ID="468">SomeGroupName</Group>
  <Group ID="408">SomeGroupName</Group>
  <Group ID="455">SomeGroupName</Group>
  <Group ID="443">SomeGroupName</Group>
  <Group ID="524">SomeGroupName</Group>
  <Group ID="414">SomeGroupName</Group>
  <Group ID="430">SomeGroupName</Group>
  <Group ID="423">SomeGroupName</Group>
  <Group ID="511">SomeGroupName</Group>
  <Group ID="482">SomeGroupName</Group>
  <Group ID="154">SomeGroupName</Group>
  <Group ID="236">SomeGroupName</Group>
  <Group ID="244">SomeGroupName</Group>
  <Group ID="367">SomeGroupName</Group>
  <Group ID="547">SomeGroupName</Group>
  <Group ID="134">SomeGroupName</Group>
  <Group ID="309">SomeGroupName</Group>
  <Group ID="26">SomeGroupName</Group>
  <Group ID="128">SomeGroupName</Group>
  <Group ID="335">SomeGroupName</Group>
  <Group ID="322">SomeGroupName</Group>
  <Group ID="164">SomeGroupName</Group>
  <Group ID="190">SomeGroupName</Group>
  <Group ID="30">SomeGroupName</Group>
  <Group ID="121">SomeGroupName</Group>
  <Group ID="276">SomeGroupName</Group>
  <Group ID="260">SomeGroupName</Group>
  <Group ID="83">SomeGroupName</Group>
  <Group ID="71">SomeGroupName</Group>
  <Group ID="591">SomeGroupName</Group>
  <Group ID="358">SomeGroupName</Group>
  <Group ID="179">SomeGroupName</Group>
  <Group ID="113">SomeGroupName</Group>
  <Group ID="148">SomeGroupName</Group>
  <Group ID="299">SomeGroupName</Group>
  <Group ID="209">SomeGroupName</Group>
  <Group ID="229">SomeGroupName</Group>
  <Group ID="8">SomeGroupName</Group>
  <Group ID="54">SomeGroupName</Group>
  <Group ID="40">SomeGroupName</Group>
  <Group ID="3">SomeGroupName</Group>
  <Group ID="1">SomeGroupName</Group>
</Groups>