"-svg" added to SVG name when exporting

When exporting an SVG from the extension in VS Code "-svg" is appended to the piece id. e.g. the resulting file name is of the form <process id>-svg.svg. The SVG isn't then detected for display unless the filename is edited.

After some discussion:
Re-reading the documentation I see now that it says "For example, when the SVG files are generated, rename the files to {{

{processId}.svg}}. ". This is easy to miss when the filename is of the form {{{processId}

-svg.svg }} and it's not obvious why it would be necessary to rename.