signrawtransaction of a P2SH-P2WPKH spend seems to be broken? I'm trying to spend a SegWit output on testnet using the Bitcoin core's RPC commands.
Without importing the private key into my wallet (i.e. w/o addwitnessaddress).
I wonder if anyone had luck spending SegWit outputs this way? Perhaps the signrawtransaction is broken in this case?
Here are the commands and my results.
What's weird is that even though the signrawtransaction itself is successful, the transaction is not valid (rejected by sendrawtransaction and rejected by block explorers as I'm trying to push it, as well).

(Please note: every time I import the key into the wallet and do an "addwitnessaddress" everything works just fine).

./bitcoin-cli -testnet createrawtransaction '[{"txid":"03a4ffcc792525b4ddaecc05054114f2ad8aff8b7563cd41cdb496e2177d0117","vout":0}]' '{"mwCwTceJvYV27KXBc3NJZys6CjsgsoeHmf":0.8}' 

020000000117017d17e296b4cd41cd63758bff8aadf214410505ccaeddb4252579ccffa4030000000000ffffffff0100b4c404000000001976a914ac19d3fd17710e6b9a331022fe92c693fdf6659588ac00000000

./bitcoin-cli -testnet signrawtransaction 020000000117017d17e296b4cd41cd63758bff8aadf214410505ccaeddb4252579ccffa4030000000000ffffffff0100b4c404000000001976a914ac19d3fd17710e6b9a331022fe92c693fdf6659588ac00000000 '[{"txid":"03a4ffcc792525b4ddaecc05054114f2ad8aff8b7563cd41cdb496e2177d0117","vout":0,"scriptPubKey":"a91421ce1507d06ed2742be0bf18a018bbcdd812a26487","redeemScript":"00149835f2e0dff9d7f6a4060140696bc7e00b12edd5"}]' '["cMahea7zqjxryy6NWaKxmhDyb1JzuNKCZAg8sxaJoXSBkRXjnib9"]' 

{
  "hex": "0200000000010117017d17e296b4cd41cd63758bff8aadf214410505ccaeddb4252579ccffa40300000000171600149835f2e0dff9d7f6a4060140696bc7e00b12edd5ffffffff0100b4c404000000001976a914ac19d3fd17710e6b9a331022fe92c693fdf6659588ac024730440220452a58cf56c45edaffb952acccd2f6f2cea523cf82e73b82f8eb5e3b3b1b17c4022011de26884cf693b12f16fdd8fa6c1d96dacb97050907353852895d9b80b3fae101210206f4bad90006f70112129815b25ba585484f1bb4f8b88f8ebaec2c76f543794300000000",
  "complete": true
}

./bitcoin-cli -testnet sendrawtransaction 0200000000010117017d17e296b4cd41cd63758bff8aadf214410505ccaeddb4252579ccffa40300000000171600149835f2e0dff9d7f6a4060140696bc7e00b12edd5ffffffff0100b4c404000000001976a914ac19d3fd17710e6b9a331022fe92c693fdf6659588ac024730440220452a58cf56c45edaffb952acccd2f6f2cea523cf82e73b82f8eb5e3b3b1b17c4022011de26884cf693b12f16fdd8fa6c1d96dacb97050907353852895d9b80b3fae101210206f4bad90006f70112129815b25ba585484f1bb4f8b88f8ebaec2c76f543794300000000

error code: -26
error message:
64: non-mandatory-script-verify-flag (Signature must be zero for failed CHECK(MULTI)SIG operation)
The wallet does not know how to sign for segwit stuff until you use addwitnessaddress. This is because it is only tracking the P2PKH outputs for that key. You have to explicitly tell it to track the witness outputs for the key by using addwitnessaddress.