Yes, good for you.
But in a network view ... this BUG is NOT acceptable.

network MUST refuse to transfer in mempool a wrongly connected transaction to "in-instant" other transaction in mempool.

lucky for all, SPV don't have mempool.
only miner ... and nodes.

that's why we MUST delete this BUG before open the SPV feature in the nodes (and miners).
that's why LN will be not deploy before SegWit.

LN don't work with malleability BUG in action.
LN must have access to mempool and be sure to not cross malleability transaction.

if you believe that you can emit double-spend in a (enforced) segwit network, you dream in color ... litterally.
https://bitcoincore.org/en/segwit_wallet_dev/