Existing transaction not found on explorer on testnet

This url results in 404 error, although you can verify using graphql that the transaction exists: https://app.fuel.network/tx/0xaa12c490df9951ea8ce035287ba323b4bd6e1f2a64434b76a8165b4ee3238bbf/simple.

The following graphql query returns the tx id, which proofs that the transaction exists:
```graphql
query {
transaction(id: "0xaa12c490df9951ea8ce035287ba323b4bd6e1f2a64434b76a8165b4ee3238bbf") {
id
}
}
```

Open the reported testnet transaction URL and run the provided GraphQL query to confirm that the transaction exists while the explorer returns 404. Trace the transaction-page entry point and determine why this existing transaction is not displayed; done means the URL resolves to the transaction instead of returning 404.

Written by the indexing model from the issue text.