When we remove the converters of the display binding, the view loads but page is blank.
<syncfusion:SfDataGrid x:Name="dataGrid" ColumnSizer="Star" AutoGenerateColumns="False" ItemsSource="{Binding TimeRegistrations}" >
<syncfusion:SfDataGrid.GroupColumnDescriptions>
<syncfusion:GroupColumnDescription ColumnName="ProjectName"/>
</syncfusion:SfDataGrid.GroupColumnDescriptions>
<syncfusion:SfDataGrid.SortColumnDescriptions>
<syncfusion:SortColumnDescription ColumnName="TaskName"
SortDirection="Ascending" />
</syncfusion:SfDataGrid.SortColumnDescriptions>
<syncfusion:SfDataGrid.Columns x:TypeArguments="syncfusion:Columns">
<syncfusion:GridTextColumn HeaderText="Task" MappingName="TaskName" HeaderCellTextSize="14" CellTextSize="12" TextAlignment="Start"/>
<syncfusion:GridTextColumn HeaderText="Invoicing" MappingName="InvoicingStatus" DisplayBinding="{Binding InvoicingStatus,
Converter={StaticResource TaskInvoicingTypeLanguageConverter}}" HeaderCellTextSize="14" CellTextSize="12"/>
<syncfusion:GridTextColumn HeaderText="Hours" MappingName="HourDuration" DisplayBinding="{Binding HourDuration,
Converter={StaticResource HourDurationDecimalToTimeSpanConverter}}" HeaderCellTextSize="14" CellTextSize="12" Width="70"/>
</syncfusion:SfDataGrid.Columns>
</syncfusion:SfDataGrid>