Line labels in subplot impacted by other subplots

Specific Domains Visualization
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1

I have a plot recipe that creates a few subplots. However, the labels that are displayed in the legend are not in the correct order in some cases and I do not understand what is wrong.

For example, in this MWE, the function plot_works() produces the correct result while plot_backward() has the sin and cos labels in subplot 2 reversed. The only difference in the recipes is that plot_works() plots both the sin and cos functions in subplot 1 and plot_backwards() only plots the sin function.

userplot Plot_Works
@recipe function f(h::Plot_Works)

    # set up the subplots 
    layout --> (2,1)
    foreground_color_legend --> nothing
    legend --> :outertop

    # Create data for plots 
    t = 0:0.01:2*pi
    y1 = sin.(t)
    y2 = cos.(t)
    
    @series begin 
        subplot := 1
        label := ["sin" "cos"]
        xaxis := ("x")
        yaxis := ("y")
        x=t 
        y=[y1, y2]
        x,y
    end

    @series begin 
        subplot := 2
        label := ["sin" "cos"]  ##### Order reversed on plot
        xaxis := ("x")
        yaxis := ("y")
        x=t 
        y=[y1, y2]
        x,y
    end
end

@userplot Plot_Backward
@recipe function f(h::Plot_Backward)

    # set up the subplots 
    layout --> (2,1)
    foreground_color_legend --> nothing
    legend --> :outertop

    # Create data for plots 
    t = 0:0.01:2*pi
    y1 = sin.(t)
    y2 = cos.(t)
    
    @series begin 
        subplot := 1
        label := "sin"
        xaxis := ("x")
        yaxis := ("y")
        x=t 
        y=y1
        x,y
    end

    @series begin 
        subplot := 2
        label --> ["sin" "cos"]  ##### Order reversed on plot
        xaxis := ("x")
        yaxis := ("y")
        x=t 
        y=[y1, y2]
        x,y
    end
end

# Make plots
plot_works()
savefig("plot_works.png")

plot_backward()
savefig("plot_backward.png")

Output of plot_works() (note both figures have sin and cos in correct order)
plot_works

Output of plot_backward() (note legend labels are reversed)
plot_backward

2

It looks like this open issue and this one.

A workaround is given at the end: to construct only one series per @series block.

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