DatePicker event handler not working

I’m able to perform some action when the button is pressed but not when the daterange changes:

using Stipple
using StippleUI
using StipplePlotly
using Random

palette = [
    "#e61c4c",
    "#004976",
    "#3fa535",
    "#9d9d9b",
]

@reactive mutable struct Dashboard <: ReactiveModel
    daterange::R{DateRange} = DateRange(today() - Day(3), (today()))
    rstring::R{String} = ""
    regen::R{Bool} = false

    plot_data1::R{Vector{PlotData}} = PlotData[]
    plot_layout1::R{PlotLayout} = PlotLayout()
    plot_data2::R{Vector{PlotData}} = [
        PlotData(
            x = 1:100, 
            y = cumsum(randn(100)), 
            plot = StipplePlotly.Charts.PLOT_TYPE_SCATTER,
            marker = PlotDataMarker(color = palette[1]),
            name = "First",
        ),
        PlotData(
            x = 1:100, 
            y = cumsum(randn(100)), 
            plot = StipplePlotly.Charts.PLOT_TYPE_SCATTER,
            marker = PlotDataMarker(color = palette[2]),
            name = "Second",
        ),
    ]
    plot_layout2::R{PlotLayout} = PlotLayout()
end

function ui(model)
    page(model, class="container", [
        heading("Dashboard")
        row([
            cell(class="st-module", [
                datepicker(:daterange, range=true, minimal=true)
            ]),
            cell(class="st-module", [
                p([
                    button("Action!", @click("regen = true"))
                ])
                p([
                    "Output: "
                    span("", @text(:rstring))
                ])
            ])
        ])
        row([
            cell(class="st-module", [
                h4("Some Plot")
                plot(:plot_data1; layout=:plot_layout1)
            ]),
            cell(class="st-module", [
                h4("Some other Plot")
                plot(:plot_data2; layout=:plot_layout2)
            ])
        ])
      ]
    )
end

function updateData!(model::M) where {M<:ReactiveModel}
    model.plot_data1[] = [
        PlotData(
            x = 1:100, 
            y = cumsum(randn(100)), 
            plot = StipplePlotly.Charts.PLOT_TYPE_SCATTER,
            marker = PlotDataMarker(color = palette[1]),
            name = "First",
        ),
        PlotData(
            x = 1:100, 
            y = cumsum(randn(100)), 
            plot = StipplePlotly.Charts.PLOT_TYPE_SCATTER,
            marker = PlotDataMarker(color = palette[2]),
            name = "Second",
        ),
    ]
    
    return nothing
end

function handlers(model::M) where {M<:ReactiveModel}
    on(model.daterange) do _
        updateData!(model)
    end
    on(model.regen) do _
        if (model.regen[])
            updateData!(model)
            model.rstring[] = Random.randstring(10)
            model.regen[] = false
        end
    end
    model
end

route("/") do
    model = Dashboard |> init |> handlers
    html(ui(model), context = @__MODULE__)
end

isrunning(:webserver) || up()

The left plot is static and the right one should change when pressing the button or changing the date range: