Transaction.vsize is incorrect for non cloned transactions

[relayking]

Noticed when making ordinals transactions, all input and outputs are taproot.

// setup taproot tx
...
clone = tx.clone()
tx.sign()
tx.finalize()
console.log(tx.vzise) // A
clone.sign()
clone.finalize()
console.log(clone.vzise) // B

B is correct and is greater than A.