As described in the title, my SfChart Tooltips have turned invisible from 25.2.7 to the latest 27.1.52. I've rolled back the update and it's working again but I'd like to keep up to date.
Here's the chart. The tooltips work fine in the 25.x version:
```
<SfChart Title="Production" @ref="@_chartInstanceMonthly" EnableAnimation="false">
<ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.DateTime" />
<ChartZoomSettings EnableMouseWheelZooming="true" EnableScrollbar="false" EnablePinchZooming="true" EnableSelectionZooming="true" ToolbarDisplayMode="ToolbarMode.Always" />
<ChartPrimaryYAxis LabelFormat="{value}" Name="bblm" Title="Barrels per Month (bbl/m)" ValueType="@_selectedValueType">
<ChartAxisLineStyle Width="0"></ChartAxisLineStyle>
<ChartAxisMajorTickLines Width="0"></ChartAxisMajorTickLines>
</ChartPrimaryYAxis>
<ChartAxes>
<ChartAxis OpposedPosition="true" RowIndex="0" Name="mcfm" Title="Thousands of Cubic Feet per month (mcf/m)" LabelFormat="{value}" ValueType="@_selectedValueType">
<ChartAxisLineStyle Width="0"></ChartAxisLineStyle>
<ChartAxisMajorGridLines Width="0"></ChartAxisMajorGridLines>
</ChartAxis>
</ChartAxes>
<ChartTooltipSettings Enable="true" Format="<b>${series.name} : ${point.y}<br/>${point.x}" />
<ChartSeriesCollection>
@foreach (NewSeriesData series in MonthlySeriesCollection)
{
<ChartSeries Name="@series.Name" XName="Timestamp" YName="Value" DataSource="@series.Data" YAxisName="@series.YAxisName" Fill="@series.Color" Type="@series.ChartSeriesType" DashArray="10" />
}
</ChartSeriesCollection>
</SfChart>
```
In 27.x, the outline of the chart appears to be there and there's a floating colored dot indicating the range the mouse is hovering over, but the rest of it is invisible.
I also tried this from the documentation to see if it was a styling issue, but it didn't change the visualization:
```
<ChartTooltipSettings Enable="true" Fill="gray">
<ChartTooltipBorder Color="#FF0000" Width="2"></ChartTooltipBorder>
</ChartTooltipSettings>
```
Any breaking changes from the old version to the new one I need to know about? I didn't see anything in the documentation.
Thanks in advance.
