Forum Discussion
Dealing with nested Document Sets
Consider this... A SharePoint Online document library accepts a content type derived from Document Set. The derived document set content type has a managed metadata site column that is set to synchr...
UPDATE: just did a test. Do not change the content type of a document set to folder! After you do so, opening the document set does this...
Fortunately changing it back restores normal behavior. Until Microsoft make document sets work completely in the modern experience, there's no way to move the child document sets back to a folder without tools. I'm planning on fixing it with Sharegate to copy them into a regular folder.
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Changing Doc Sets to Folders and receiving a 404 is also a bug on-prem, as well. So it isn't exclusive to Modern sites.