Wrong computed message hash for ext message

[eran-utila]

Hi,
When I publish transactions to the chain, I calculate the message hash, and use it later to track the transaction.
Unfortunately, since yesterday, I have experienced multiple occurrences where the in memory computed message hash for the boc, did not match the one on the chain.
I have not made any related changes to my code recently, and I also have not upgraded my tongo version (I am using v1.9.0).
It kept happening even after upgrading the tongo version to v1.14.4.
Is it possible that the hash computation algorithm in the chain has changed and the the algorithm in tongo is no longer relevant?

here is a code snippet which fetches the message from the chain, and computes the hash, and we can see we get a different result:

func Test_FailingTx(t *testing.T) {
	tonKeeprClient, err := tap.New()
	require.NoError(t, err)

	failingTx := "7cd5ce546570218f31e0ea233a245cdd693fdf38bdbdbb620a8284eefe427891"
	tx, err := tonKeeprClient.GetBlockchainTransactionByMessageHash(
		context.Background(),
		tap.GetBlockchainTransactionByMessageHashParams{
			MsgID: failingTx,
		},
	)
	require.NoError(t, err)

	inMsg := tx.InMsg
	fmt.Println(inMsg)

	msgBody := inMsg.Value.RawBody
	hash := inMsg.Value.Hash

	fmt.Printf("real hash %s\n", hash)

	bodyBocs, err := boc.DeserializeBocHex(msgBody.Value)
	require.NoError(t, err)
	require.Len(t, bodyBocs, 1)

	accountID := ton.MustParseAccountID(tx.GetAccount().Address)
	require.NoError(t, err)

	require.False(t, inMsg.Value.Init.IsSet())

	extMsg, err := ton.CreateExternalMessage(
		accountID,
		bodyBocs[0],
		nil,
		tlb.VarUInteger16{},
	)
	require.NoError(t, err)

	extMsgCell := boc.NewCell()
	err = tlb.Marshal(extMsgCell, extMsg)
	require.NoError(t, err)

	computedHash, err := extMsgCell.HashString()
	require.NoError(t, err)

	require.NoError(t, err)
	fmt.Printf("computed hash %s\n", computedHash)
}

[sebixx854]

func Test_FailingTx(t *testing.T) {
tonKeeprClient, err := tap.New()
require.NoError(t, err)

failingTx := "7cd5ce546570218f31e0ea233a245cdd693fdf38bdbdbb620a8284eefe427891"
tx, err := tonKeeprClient.GetBlockchainTransactionByMessageHash(
	context.Background(),
	tap.GetBlockchainTransactionByMessageHashParams{
		MsgID: failingTx,
	},
)
require.NoError(t, err)

inMsg := tx.InMsg
fmt.Println(inMsg)

msgBody := inMsg.Value.RawBody
hash := inMsg.Value.Hash

fmt.Printf("real hash %s\n", hash)

bodyBocs, err := boc.DeserializeBocHex(msgBody.Value)
require.NoError(t, err)
require.Len(t, bodyBocs, 1)

accountID := ton.MustParseAccountID(tx.GetAccount().Address)
require.NoError(t, err)

require.False(t, inMsg.Value.Init.IsSet())

extMsg, err := ton.CreateExternalMessage(
	accountID,
	bodyBocs[0],
	nil,
	tlb.VarUInteger16{},
)
require.NoError(t, err)

extMsgCell := boc.NewCell()
err = tlb.Marshal(extMsgCell, extMsg)
require.NoError(t, err)

computedHash, err := extMsgCell.HashString()
require.NoError(t, err)

require.NoError(t, err)
fmt.Printf("computed hash %s\n", computedHash)

}