Tikz nodes with pattern ignoring z-order/fill

I’m trying to draw overlapping circles with patterns aka hatches. Overlapping circles are meant to hide underlying circles. This is the way it usually works without patterns, but as soon as I add patterns, the value for fill seems to be completely ignored.

Is there any way to use patterns with fill? Thanks in advance!

documentclass{article}
usepackage{tikz}
usetikzlibrary{%
    shapes.misc,    % additional shapes, such as rounded rectangles
    positioning,    % advanced positioning
    patterns,       % hatches etc
}

begin{document}
begin{tikzpicture}[%
    roundnode/.style={circle, draw=black, fill=yellow!20, thick, inner sep=0em, opacity=1, fill opacity=1, draw opacity=1, font=small},
    ]
    
    node[roundnode, minimum size=15mm] (nodeA) at (1, 0) {A};
    node[roundnode, minimum size=15mm, fill=red!20, pattern=north west lines, pattern color=gray] (nodeB) at (2, 0) {B};
    
    node[roundnode, minimum size=15mm] (nodeC) at (2, 1) {C};
    node[roundnode, minimum size=15mm, pattern=north east lines, pattern color=gray] (nodeD) at (2, -1) {D};
    
end{tikzpicture}
end{document}

documentclass{article}
usepackage{tikz}
usetikzlibrary{%
    shapes.misc,    % additional shapes, such as rounded rectangles
    positioning,    % advanced positioning
    patterns,       % hatches etc
}

begin{document}
begin{tikzpicture}[%
    roundnode/.style={circle, draw=black, fill=yellow!20, thick, inner sep=0em, opacity=1, fill opacity=1, draw opacity=1, font=small},
    ]
    
    node[roundnode, minimum size=15mm] (nodeA) at (1, 0) {A};
    node[roundnode, minimum size=15mm, fill=red!20, 
        postaction={pattern=north west lines, pattern color=gray}] (nodeB) at (2, 0) {B};
    
    node[roundnode, minimum size=15mm] (nodeC) at (2, 1) {C};
    node[roundnode, minimum size=15mm, 
        postaction={pattern=north east lines, pattern color=gray}] (nodeD) at (2, -1) {D};
    
end{tikzpicture}
end{document}