3D plots in PDFs generated with `interp` shading disappear from SVG

[rlkamalapurkar]

I generated a PDF file using

\documentclass{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}
\begin{document}
    \begin{tikzpicture}
        \begin{axis}
            \addplot3[ surf, shader=interp, samples=10, domain=0:1, ]{x^2*y};
        \end{axis}
    \end{tikzpicture}
\end{document}

and converted it to SVG using dvisvgm --pdf document.pdf. The resulting SVG file only has the axis lines, but the surface plot is gone.

[mgieseki]

dvisvgm doesn't support shading patterns as used for PDF gradient fills. So it's currently not possible to fully convert PDF or EPS files that contain these kind of patterns.