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I was testing your Dropdown Tree component and detected 2 problems that I will now describe.
It is not possible to use Guid as an ID. I took the selection example (https://blazor.syncfusion.com/demos/dropdown-tree/selection?theme=fluent) and changed the string id to Guid. The page loads without problems, no errors are displayed, but the DropdownTree is displayed blank. (example attached (SelectionGuid))
The other problem is with the filtering.
If I make an await before build the data (for example to get data from the database to load into the Tree), the filter is not working, the Tree is loaded correctly but the filter does not do nothing. (example