Unsupported request - method type: get

We got this message when we tried to get an attachment comment for one of our accounts:
{
"error": {
"message": "Unsupported request - method type: get",
"type": "GraphMethodException",
"code": 100,
"fbtrace_id": "AoCtBAwgyPeW-UuNbJlvB2D"
}
}
Doing further investigation, we determined that the API breaks when attempting to get a story attachment for a comment. The API breaks unless I reduce the param request fields for attachments to id,attachment{media_type,title,type,unshimmed_url,url}, but we still require attachment.media and attachment.description for our capturing content process.
Has anyone faced this error before ? Are there any workaround to solve this issue ?