Axis label disappears when axis style are different

[Why-not-now]

When the axis lines are different style, i.e. using the code below,

\documentclass[a4paper]{article}
\usepackage{pgfplots}

\begin{document}
\begin{tikzpicture}[
    ]
    \begin{axis}[
        axis x line = center,
        axis y line = center,
        axis z line = none,
        xmin = 0, xmax = 30,
        ymin = -200, ymax = 1000,
        zmin = 0, zmax = 1,
        ]
    \end{axis}
\end{tikzpicture}
\end{document}

The axis tick labels do not show up.

But when the axis lines are the same style,

\documentclass[a4paper]{article}
\usepackage{pgfplots}

\begin{document}
\begin{tikzpicture}[
    ]
    \begin{axis}[
        axis x line = center,
        axis y line = center,
        axis z line = center,
        xmin = 0, xmax = 30,
        ymin = -200, ymax = 1000,
        zmin = 0, zmax = 1,
        ]
    \end{axis}
\end{tikzpicture}
\end{document}

The axis tick labels do show up.

[hmenke]

I tracked it down to /pgfplots/axis z line*/none which sets

\def\pgfplots@zaxislinesnum{4}
\def\pgfplots@ztickposnum{4}

but from there on the code becomes too complex for me to really evaluate what is the issue.

The following MWE reproduces the problem:

\documentclass[a4paper]{article}
\usepackage{pgfplots}
\begin{document}
\begin{tikzpicture}
  \begin{axis}[
    axis x line = center,
    axis y line = center,
    axis z line = center,
    xmin = 0, xmax = 1,
    ymin = 0, ymax = 1,
    zmin = 0, zmax = 1,
    ]
    \makeatletter
    % from /pgfplots/axis z line*/none
    \def\pgfplots@zaxislinesnum{4}
    \def\pgfplots@ztickposnum{4}
    \makeatother
  \end{axis}
\end{tikzpicture}
\end{document}