Because of text-align tag in svg file magick couldnt convert it to png
in "sc-actions-kwave_zoom_original.svgz" file there are a couple of text-align tags it looks like imagemagick ( convert ) doesnt like it and couldnt convert it to png and it fails to generate "kwave_zoom_original.png" file with error :
convert-im6.q16: non-conforming drawing primitive definition
text-align' @ error/draw.c/RenderMVGContent/4300.`
on the other hand, whenever i remove those 3 text-align tags everything works perfect