Comment 2 for bug 941174

Your zip archive only includes one SVG exmaple: "MessKette.svg". Taking a closer look at this SVG files reveals:
The second copies of most of the text objects are actually _in_ the SVG file (inside nested groups with one of them having fill and stroke set to 'None' (see attached modified version which has the invisible text (fill: None) made visible.

SVG snippet of such an invisible text:
    <g
       transform="matrix(0.03537273,0,0,0.03537273,0.26645914,891.84749)"
       style="fill-rule:evenodd;visibility:visible"
       id="g4281">
      <desc
         id="desc4283">Drawing</desc>
      <g
         id="g4285">
        <g
           style="fill:none;stroke:none"
           id="g4287">
          <rect
             x="-14"
             y="-14"
             width="1820"
             height="758"
             id="rect4289" />
        </g>
        <g
           id="g4291">
          <g
             style="font-size:353px;font-weight:400;font-family:Liberation Sans embedded"
             id="g4293">
            <g
               style="fill:none;stroke:none"
               id="g4295">
              <text
                 id="text4297">
                <tspan
                   x="250 525 720 915 991 1067"
                   y="443"
                   id="tspan4299">Quelle</tspan>
              </text>
            </g>
          </g>
        </g>
      </g>
    </g>