I had this same issue. I was keeping track of versions and had a workflow running when I uploaded a document to my document set. When ever it was uploaded I received the same error. What I found is that the "Automatically update the workflow stat to current stage name" was actually creating a new version. this caused a problem with the form thinking it was creating v.2 when in reality it was creating v.3 so I received the something went wrong message. I unchecked the Automatically update.... and I did not have any more issue.
Andrew
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