Indesign 13.1/13.0.1, macOS, UTS 6.1.5

When copy-pasting text or text frames from one document to another or even in the same document, paragraph style is changed to "standard copy".
The correct paragraph style is present, allocated and identical in all documents.
The paragraph style "standard"/"standard copy" is not present in any document (german version) before copy-pasting.