Object cannot be cast from DBNull to other types when conn.open

[yucikala]

Software versions
Server type (MySQL, MariaDB, Aurora, etc.) and version: 10.11.2-MariaDB-log
.NET version: .NET 5.0

Describe the bug
When program try to connect, It crash... ("Object cannot be cast from DBNull to other types."

Exception
"Object cannot be cast from DBNull to other types."

at System.DBNull.System.IConvertible.ToInt32(IFormatProvider provider)
at MySql.Data.MySqlClient.Driver.LoadCharacterSets(MySqlConnection connection)
at MySql.Data.MySqlClient.Driver.Configure(MySqlConnection connection)
at MySql.Data.MySqlClient.MySqlConnection.Open()
at MysqlBackup.Program.ProcessServerExport(ConfigExclude excludeConfig, Server server) in D:\Projekty\smallprograms\MysqlBackup\Program.cs:line 145
at MysqlBackup.Program.Execute(Options opts) in D:\Projekty\smallprograms\MysqlBackup\Program.cs:line 90

Code sample
//connstring is with example values
constring = "server=myserver;Port=3306;user=userlogin;pwd="=password123456";database=dbName;convertzerodatetime=true;";
using (var conn = new MySqlConnection(constring))
{
using (var cmd = new MySqlCommand())
{
using (var mb = new MySqlBackup(cmd))
{
cmd.Connection = conn;
cmd.CommandTimeout = 99999;
conn.Open(); //here is the problem

/* A concise code sample to reproduce the bug */

Expected behavior
Normal connection. To other databases is ok, but i have one, where is problem.

The main problem is, that i can not change Mysql.Data to MysqlConnection. And new version ov MariaDB return null ID of collation.

see more mysql-net/MySqlConnector#1322