使用FirebirdSql.Data.FirebirdClient连接Firebird3无错误消息问题求助

使用Firebird 3数据库服务器，通过.NET库FirebirdSql.Data.FirebirdClient（已尝试7.10.1及最新10.3.2版本）连接时，执行错误SQL语句（例如删除约束的语句）会触发如下错误：

FirebirdSql.Data.FirebirdClient.FbException: unsuccessful metadata update

ALTER TABLE mytable failed

No message for error code 336068738 found.

已尝试以下操作但问题仍未解决，还出现过错误码336068731：

• 将firebird.msg文件复制到system32和wow64文件夹
• 配置环境变量FIREBIRD_MSG=C:\Program Files\Firebird\Firebird_3_0\firebird.msg

相关C#代码如下：

if (DbProviderFactories.GetFactory("FirebirdSql.Data.FirebirdClient") is not FirebirdClientFactory fac)
{
    throw new InvalidOperationException("FirebirdSql.Data.FirebirdClient.dll could not be loaded.");
}

var host = "localhost";
var user = "SYSDBA";
var pass = "masterkey";
var db = $"c:/databases/DelphiIn2025QuestionmarkQuestionmark.fdb";

var bld = new FbConnectionStringBuilder
{
    Charset = "NONE",
    DataSource = host,
    Database = db,
    UserID = user,
    Password = pass,
    WireCrypt = FbWireCrypt.Enabled
};

using (var con = fac.CreateConnection() as FbConnection)
{
    if (con == null) 
    { 
        throw new InvalidOperationException("No FbConnection returned..."); 
    }

    con.ConnectionString = bld.ConnectionString;
    con.Open();

    using (var cmd = fac.CreateCommand() as FbCommand)
    {
        if (cmd == null) { throw new InvalidOperationException("No FbCommand returned..."); }
        cmd.Connection = con;

        cmd.CommandText = "alter table mytable drop constraint PK_uid";
        cmd.ExecuteNonQuery();
    }
}

内容的提问来源于stack exchange，提问作者MHolzmayr