Only the first item is displayed in the DataGrid group

[LadislavLang]

• .NET Core Version: 7 (It's working in dotnet6 !)
• Windows version: 11
• Does the bug reproduce also in WPF for .NET Framework 4.8?: No

Problem description:
Set up a DataGrid where the ItemSource is a ListCollectionView with configured GroupDescription and use it with a simple GroupStyle:

         <DataGrid.GroupStyle>
            <GroupStyle>
                <GroupStyle.Panel>
                    <ItemsPanelTemplate>
                        <DataGridRowsPresenter/>
                    </ItemsPanelTemplate>
                </GroupStyle.Panel>
            </GroupStyle>
        </DataGrid.GroupStyle>

Expected/Actual behavior:
It should disply all items (grouped), but only the first item is displayed in each group,
see

Minimal repro:
DotNet7WPFGroupingBug.zip

[LadislavLang]

This seems to fix the bug:

        <DataGrid.GroupStyle>
            <GroupStyle>
                <!--<GroupStyle.Panel>
                    <ItemsPanelTemplate>
                        <DataGridRowsPresenter />
                    </ItemsPanelTemplate>
                </GroupStyle.Panel>-->
            </GroupStyle>
        </DataGrid.GroupStyle>

[to87al]

I can confirm the same issue. Hoping we have a fix soon.