bug: Balancer initializes grpc pool with 2 connections refers to different endpoints

[YuriyKortev]

Bug Report

YDB GO SDK version:

v3.84.1

Environment

Ubuntu, x86_64

Current behavior:

Balancers initializes grpc pool with 2 connections refers to different endpoints. First correct and second to localhost.
As a result following error occures:

[error] failed to initialize database, got error transport/Unavailable (code = 14, source error = "rpc error: code = Unavailable desc = last connection error: connection error: desc = \"transport: Error while dialing: dial tcp 127.0.0.1:2136: connect: connection refused\"", address: "localhost:2136", nodeID = 1, traceID: "e3fb36d4-10ae-4b4a-bddb-a7c80d4418b8") at `github.com/ydb-platform/ydb-go-sdk/v3/internal/conn.invoke(conn.go:392)` at `github.com/ydb-platform/ydb-go-sdk/v3/internal/balancer.(*Balancer).wrapCall(balancer.go:313)` at `github.com/ydb-platform/ydb-go-sdk/v3/internal/table.newSession(session.go:142)` at `github.com/ydb-platform/ydb-go-sdk/v3/internal/table.(*Client).CreateSession.func1(client.go:108)` at `github.com/ydb-platform/ydb-go-sdk/v3/internal/table.(*Client).CreateSession(client.go:116)` at `github.com/ydb-platform/ydb-go-sdk/v3/internal/xsql.(*Connector).Connect(connector.go:348)`
transport/Unavailable (code = 14, source error = "rpc error: code = Unavailable desc = last connection error: connection error: desc = \"transport: Error while dialing: dial tcp 127.0.0.1:2136: connect: connection refused\"", address: "localhost:2136", nodeID = 1, traceID: "e3fb36d4-10ae-4b4a-bddb-a7c80d4418b8") at `github.com/ydb-platform/ydb-go-sdk/v3/internal/conn.invoke(conn.go:392)` at `github.com/ydb-platform/ydb-go-sdk/v3/internal/balancer.(*Balancer).wrapCall(balancer.go:313)` at `github.com/ydb-platform/ydb-go-sdk/v3/internal/table.newSession(session.go:142)` at `github.com/ydb-platform/ydb-go-sdk/v3/internal/table.(*Client).CreateSession.func1(client.go:108)` at `github.com/ydb-platform/ydb-go-sdk/v3/internal/table.(*Client).CreateSession(client.go:116)` at `github.com/ydb-platform/ydb-go-sdk/v3/internal/xsql.(*Connector).Connect(connector.go:348)`

Expected behavior:

All connections in pool a refers to a correct endpoint specified in constructor.

Steps to reproduce:

Use not a localhost endpoint

Related code:

	db, err := gorm.Open(ydb.Open(
		"grpc://192.168.20.20:2136/local",
		ydb.With(ydb2.WithStaticCredentials(
			"user1",
			"pswd",
		),
			//ydb2.With(config.WithNoAutoRetry()), ydb2.WithBalancer(balancers.SingleConn()), // UNCOMMENT FOR WORKAROUND
		),
	), &gorm.Config{
		Logger: logger.New(
			log.Default(),
			logger.Config{
				SlowThreshold: time.Second,
				LogLevel:      logger.Error,
			},
		),
	})
	if err != nil {
		fmt.Println(err)

		err = s.CloseConnect(db)
		if err != nil {
			return nil, err
		}

		return nil, err
	}

Other information:

uncomment line from the example for a workaround.

debug screen