Datagrid Grouping is broken when using GroupHeaderTemplate

User grouping by dragging a column is currently broken on the DataGrid with GroupHeaderTemplate example.

chrome-capture-2026-01-12

This issue started occurring after I updated from 8.4.2, so it got broken somewhere from 8.4.3-Current.

Thanks for your continued support on this forum site.

Thanks for the report! Fixed immediately and the fix will be published later today:

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