Errored messages are not showing Error Type

We are experiencing issues with long automated messages failing to send.
There are carriers that take the long messages and carriers that don’t - we want to just retry the ones that fail. I get that I can circumvent this problem by splitting the long message into multiple small messages and send them separately. But since most of the times the messages are delivered, we don’t want to have to split successful messages because of a few unsuccessful ones.

After the message is sent, I am using this endpoint to fetch the message again:
"https://api2.frontapp.com/messages/{message_id}”
What I want is to see if it errored or not.
 

The issue is that I am getting the field ‘Error Type’ empty even for failed messages.
Anyone has any advice here? How can I get from the API the error status of a message?