Unexpected border in legend

[User134806]

When using bar interval plots, an unexpected border appears around the legend entry. But it seems that this is also the case for other types of graph. See for example Unexpected borders on legends of stacked bars in pgfplots and Unexpected border in legend with bar interval plots.

\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}

\begin{document}
\begin{tikzpicture}
    \begin{axis}[ybar interval, legend entries={A legend}]
        \addplot+[fill=red!50!white, 
        draw=none,
        % draw opacity=0,
        ]
        coordinates {(0,2) (0.1,1) (0.3,0.5) (0.35,4) (0.5,3) (0.6,2) (0.7,1.5) (1,1.5)};
    \end{axis}
\end{tikzpicture}
\end{document}