Cant see tooltip data when hovering over multi line graph

[nguenauer]

Describe the bug
When using a multiline Chart and hovering over a chart i cannot see any text in the tooltip. I would expect to see the value at the given point.

Expected behavior
See Value A and Value B at the mouse hoverpoint

Screenshots

Additional context
Laravel 11, Livewire 3 Controller:

    protected function buildCallChart(Carbon $start, Carbon $end): LineChartModel
    {
        $invoices = Invoice::whereBetween('billing_period', [
            $start->format('Y.m'),
            $end->format('Y.m')
        ])->get();

        $grouped = $invoices->groupBy('billing_period')->sortKeys();

        $chart = (new LineChartModel())
            ->setTitle("Monthly Inbound vs Outbound Calls")
            ->setAnimated(true)
            ->withGrid()
            ->multiLine()
            ->withLegend()
            ->withDataLabels()
            ->setColors(['#3b82f6', '#ef4444']);

        foreach ($grouped as $month => $data) {
            $label = Carbon::createFromFormat('Y-m', $month)->format('M Y');
            $chart->addSeriesPoint('Inbound Calls', $label, $data->sum('incoming_calls'));
            $chart->addSeriesPoint('Outbound Calls', $label, $data->sum('outbound_calls'));
        }

        return $chart;
    }

Blade:
<livewire:livewire-line-chart key="{{ $chart->reactiveKey() }}" :line-chart-model="$chart" />

Couldn't find a reason why the tooltip stays empty. Appreciating any help