Comment 4 for bug 1416734

The content of the provided test case ( Feuerwehrzeichen1neu.svg ) originates from an earlier PDF or (E)PS import, based on the vertically flipped and scaled layer group:

<g
     id="g10"
     inkscape:groupmode="layer"
     inkscape:label="Feuerwehrzeichen1"
     transform="matrix(1.25,0,0,-1.25,0,744.0945)">

AFAIU symbol creation (from selected content) ought to compensate any preserved transforms on parent containers. Workaround for affected files: add a new layer, move content to new layer before creating new symbols based on the imported content.