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Displaying a simple static class content in SfDataGrid and then doing a rapid sequence of single row drag and drops (ie. simulating manually rearranging or sorting the grid rows with mouse) raises the following exception: 

Exception thrown: 'System.InvalidCastException' in PresentationFramework.dll Unable to cast object of type 'System.Collections.Hashtable' to type 'System.String'. The program '[55896] RX_Mockups_WPF_2.exe: Program Trace' has exited with code 0 (0x0). The program '[55896] RX_Mockups_WPF_2.exe' has exited with code -1 (0xffffffff). The program '[55896] RX_Mockups_WPF_2.exe: Managed (v4.6, v4.5, v4.0)' has exited with code -1 (0xffffffff). 

Was tested and found to throw this exception on both v17.2.0.39 and v17.1.0.53 controls (WPF) and using .net framework 4.7.2 and when testing v17.1.0.53 with .net framework 4.6.1 

I attach the VS2019 code.