Group headers randomly disappear on iOS When updated

[michaelstonis]

Description

I have a grouped ListView in iOS that when the ObservableCollection is updated will lose the header content. I have tried using an OOTB view cell and a custom cell, but the displayed text is lost in the header group. If the user scrolls or updates the filter, the header will repopulate sometimes.

https://github.com/dotnet/maui/assets/120685/3511fde3-2df0-4508-938e-f1b66257d26a

Steps to Reproduce

1. Grab the reproduction code.
2. Tap Hamburger Menu > Reactive UI > Dynamic Data - Filter
3. Click Load Data
4. Once data has loaded, type V or Z

Link to public reproduction project repository

https://github.com/michaelstonis/RxMAUI/tree/feature/filter-grouping

Version with bug

8.0.3

Is this a regression from previous behavior?

Yes, this used to work in Xamarin.Forms

Last version that worked well

Unknown/Other

Affected platforms

iOS

Affected platform versions

No response

Did you find any workaround?

No.

Relevant log output

No response

[ghost]

We've added this issue to our backlog, and we will work to address it as time and resources allow. If you have any additional information or questions about this issue, please leave a comment. For additional info about issue management, please read our Triage Process.

[HansenPeter]

I'm having the same issue (currently using iOS 17.2 simulator), and have not yet found a solution.

In my case I'm using the Cell.Appearing event to call my backend for more data, and seemingly random group headers will go blank (even if their group content was not updated). Scrolling the group header in and out of view will also randomly make the correct header reappear.

If anyone finds a workaround, please let us know!

[tomzeni]

I'm having the same issue. randomly one our two group headers will disappear... easy to reproduce... on simulator and on real device... imho not usable in this condition... please fix this soon

[era-maui]

We have the same experience. The the cell in the GroupHeaderTemplate also seems to become blank if you rotate the iOS device and do some scrolling

[jari-schuurman]

I also see this happening on Windows; anyone found the solution?

[hardikphd]

We have work around it by replacing Collection with gropping to Expander component with collection as body.

<VerticalStackLayout Spacing="6" BindableLayout.ItemsSource="{Binding CollectionByGroups}">
                <BindableLayout.ItemTemplate>
                    <DataTemplate x:DataType="viewModel:CollectionGroup">
                        <epj:Expander IsExpanded="{Binding IsExpanded}" 
                                      Command="{Binding SelectItemCommand, Source={RelativeSource AncestorType={x:Type viewModel:CollectionByGroupViewModel}}}"
                                      CommandParameter="{Binding .}">
                            <epj:Expander.HeaderContent>
                            <..Header.>
                            </epj:Expander.HeaderContent>
                            <CollectionView >
                                <CollectionView.ItemTemplate>
                                    <DataTemplate x:DataType="viewModel:ItemViewModel">
<..Item Body...>
                                    </DataTemplate>
                                </CollectionView.ItemTemplate>
                            </CollectionView>
                        </epj:Expander>
                    </DataTemplate>
                </BindableLayout.ItemTemplate>
            </VerticalStackLayout>

        where epj is Expander.Maui nuget

[prasad210]

Any Updates on this issue ??