Upload ColdCard Signed PSBT, Caravan prompts error "Signature for input 2 is invalid."

[caixiao-QA]

Network：Testnet
ColdCard Version：3.2.2
Caravan Version：v0.3.5

1. create a P2WSH 2of3 Multisig wallet
2. Send transaction, amout select MAX
3. ColdCard signature PSBT transaction,and Upload Signed PSBT,Caravan prompts error "Signature for input 2 is invalid."
   

Provide some test information to help you reproduce the problem

1.Test Mnemonic: abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about
2.Attachment contains wallet and psbt file
CaravanTestFile.zip

1538-My Multisig Wallet-part.psbt  //ColdCard signed PSBT
1538-My Multisig Wallet.psbt  //Caravan export PSBT
wc-My Multisig Wallet.txt  //Craravan export ColdCard config
bitcoin-2-of-3-P2WSH-My Multisig Wallet-CaravanTest.json  //Craravan export wallet config

[humanumbrella]

May be related to unchained-capital/unchained-bitcoin#27

Checking into this tonight.

[humanumbrella]

First tried on simulator but was complaining about not 24 words.
So I tried to run on MK2 I have but it failed to sign, stuck on Validating...
Updated firmware on MK2 but still same ^. Weird.
I then updated my simulator per Coldcard/firmware@d3e2ef0 so it would allow 12 words and finally am able to reproduce the problem locally.

I need to dig in a bit more to figure out what's actually going on. Will spend some more time on it tomorrow. Thank you for your patience.