MariaDB 10.6 cannot be used from C# client applications

Chose MariaDB version:6

Query: drop table t1;

Done.

Query: create table t1 (n int, m varchar(50)) default charset utf8;

Done.

Query: insert into t1 values(1, 'Déjà Noël ?');

Done.

Query: select * from t1;

System.Int32: n = 1

System.String: m = Déjà Noël ?

============================

Query: show create table t1;

System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.

   at System.Collections.Generic.Dictionary`2.get_Item(TKey key)

   at MySql.Data.MySqlClient.MySqlField.SetFieldEncoding()

   at MySql.Data.MySqlClient.NativeDriver.GetColumnData(MySqlField field)

   at MySql.Data.MySqlClient.NativeDriver.GetColumnsData(MySqlField[] columns)

   at MySql.Data.MySqlClient.Driver.GetColumns(Int32 count)

   at MySql.Data.MySqlClient.ResultSet.LoadColumns(Int32 numCols)

   at MySql.Data.MySqlClient.ResultSet..ctor(Driver d, Int32 statementId, Int32 numCols)

   at MySql.Data.MySqlClient.Driver.NextResult(Int32 statementId, Boolean force)

   at MySql.Data.MySqlClient.MySqlDataReader.NextResult()

   at MySql.Data.MySqlClient.MySqlDataReader.Close()

   at MySql.Data.MySqlClient.MySqlCommand.ResetReader()

   at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)

   at MySql.Data.MySqlClient.MySqlCommand.ExecuteDbDataReader(CommandBehavior behavior)

   at System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior)

   at System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)

   at System.Data.Common.DbDataAdapter.Fill(DataTable[] dataTables, Int32 startRecord, Int32 maxRecords, IDbCommand command, CommandBehavior behavior)

   at System.Data.Common.DbDataAdapter.Fill(DataTable dataTable)

   at MyTest.Program.Main(String[] args) in C:\vc2013\Projects\MyTest\MyTest\Program.cs:line 52

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select version();