Why was this transaction accepted?

Why was this transaction accepted?

In testnet, txid:fb7a8658ec015133e36e2cf7ddf7e8c887c3a5becec2f30f24ebfe43e72f4b59 transaction has two inputs. This two inputs indicate the same txid and vout, 6a08723bc717e1ddf91fa60fde25784ef66952e8687f3bffe391fc2c819dbfd9:1.

Is this a double spending?

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