RaiseError or unhandled exception after a SOAP call

Hello everyone. I have experienced the following situation.

I have an interactive form designed with Adobe LiveCycle Designer ES4 which is then executed with Adobe Acrobat Standard DC (Version: 2015.006.30457). The form is utilizing the functionality of the Net.SOAP object for obtaining some data.

When the content-type of the response was "text/xml" or "application/json", for example when requesting SharePoint data, all worked as expected for both synchronous and asynchronous calls.

However, for the response below when the call was made synchronously Adobe Standard generated RaiseError pointing to the Net.SOAP.request() method. If, alternatively, the call was made asynchronously the callback function was not invoked and the rest of the code continued executing as if nothing had happened. In the latter case though upon exiting Adobe Acrobat, "Adobe Acrobat DC has stopped working" and “An unhandled exception occurred in Acrobat.exe [ some number ]” messages were generated.

Response raw data from the server:

HTTP/1.1 200 OK

Server: Apache-Coyote/1.1

Content-Type: multipart/related; boundary="MIMEBoundary_67f476708814c228e21476171933b4c45e524344efdc9e24"; type="application/xop+xml"; start="<0.77f476708814c228e21476171933b4c45e524344efdc9e24@apache.org>"; start-info="text/xml"

Date: Tue, 20 Nov 2018 06:33:57 GMT

Content-Length: 1781

--MIMEBoundary_67f476708814c228e21476171933b4c45e524344efdc9e24

Content-Type: application/xop+xml; charset=UTF-8; type="text/xml"

Content-Transfer-Encoding: binary

Content-ID: <0.77f476708814c228e21476171933b4c45e524344efdc9e24@apache.org>

<?xml version='1.0' encoding='UTF-8'?>?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
< ... some valid XML content ... ></soapenv:Envelope>

--MIMEBoundary_67f476708814c228e21476171933b4c45e524344efdc9e24--

I have searched on the Internet for any clues but failed to find anything related.

Has anyone experienced an issue like that? I'll much appreciate any suggestion how to resolve it.

Thank you!