Linked images don't show up, warnings from Help->Tutorials->Inkscape Tracing Pixel Art

• Windows 10, Inkscape 1.1-dev (628b187, 2020-10-19)
• run inkscape
• choose menu item Help->Tutorials->Inkscape Tracing Pixel Art
• immediately get the warning message below, as the tutorial is being loaded:

** (org.inkscape.Inkscape:8164): WARNING **: 07:21:45.533: xlink:href did not resolve to a valid image file, now trying sodipodi:absref="/home/gellert/workspace/inkscape/documentation/tutorials/tracing-pixelart/pixelart-dialog.png"