Error in Integration Object in version 19.2

Hi Everyone,

I'm making a call to micro service through Integration Object and it is working fine if the parsing option selected is "Return RAW response body".

If the parsing option is changed to "Convert JSON to Appian Value" and the check box "Convert base64 values to Appian document" is selected then the integration call fails with below error.

Could not cast from List of Dictionary to Dictionary. Details: CastInvalid

Kindly assist in resolving this. Or is there any limitation in Appian ?

NOTE: The document size will be around 1 mb to 2 mb in size.

The response JSON will be around 1700 lines.

Thanks in Advance