NRE in Sqlite's 3 preview 5

[Tragetaschen]

I have migrated my existing .NET core application to .NET Core 3.0 Preview 5 and also updated Microsoft.Data.Sqlite from 2.2.4 to 3.0.0-preview5.19227.1. With the new version, I'm getting a NullReferenceException I didn't get before.

In my constructor, I build a command:

saveCommand = connection.CreateCommand();
saveCommand.CommandText = @"INSERT INTO ...";
saveCommand.Parameters.Add(new SqliteParameter("@p0", null));
//...
saveCommand.Prepare();

and later, I issue that command:

saveCommand.Parameters[0].Value = 0; // actual data
//...
try
{
    await saveCommand.ExecuteScalarAsync();
}
catch (Exception e)
{
    Environment.FailFast("Database work failed", e);
}

With preview5, I'm consistently hitting that FailFast with the exception

Exception details:
System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.Data.Sqlite.SqliteDataReader.Read()
   at Microsoft.Data.Sqlite.SqliteCommand.ExecuteScalar()
   at System.Data.Common.DbCommand.ExecuteScalarAsync(CancellationToken cancellationToken)
--- End of stack trace from previous location where exception was thrown ---
   at myCode.Save

Using 2.2.4 instead of the preview still works fine on netcoreapp3.0

Further technical details

EF Core version: 3.0.0-preview5.19227.1
Database Provider: Microsoft.Data.Sqlite
Operating system: Linux/arm
IDE: VS 16.1.1