[bug] Errors during USDC transfer from Avalanche -> Fantom

[tsadovska]

Is there an existing issue for this?

• [X] I have searched the existing issues

Current Behavior

• Warning to register asset is shown for already registered asset.
• Sometimes Insufficient token allowance error appears in Console after user approves transaction for the first time (noticed 2 times).

Error: Insufficient token allowance
    at xk.approve (main.js:2:18213274)
    at async xk.send (main.js:2:18214283)
    at async Vne.send (main.js:37:444181)
    at async Object.send (main.js:37:572335)
    at async Object.onClick (main.js:137:5042)

• "MetaMask - RPC Error: Invalid transaction params" error appears in Console after user clicks on Claim button (noticed 1 time)

MetaMask - RPC Error: Invalid transaction params: specified gasPrice but also included maxFeePerGas, these cannot be mixed {code: -32603, message: 'Invalid transaction params: specified gasPrice but also included maxFeePerGas, these cannot be mixed'}

Expected Behavior

Warning to register token should not be shown for already registered token. Transaction should proceed without errors.

Steps To Reproduce

1. Connect Metamask wallets in From and To sections
2. Prepare to send USDC from Avalanche to Fantom
3. Check if warning to register asset is displayed (actual result: warning to register asset is displayed)
4. Type Amount 0.00212 USDC
5. Click "Approve and proceed with transaction" button (actual result: Sometimes Insufficient token allowance error appears)
6. Click "Approve and proceed with transaction" button again
7. Check if transaction is started (actual result: transaction is started)
8. Click on Claim button (actual result: Metamask RPC error appears)
9. Click on Claim button again
10. Check if transaction is completed

Environment

- OS: macOS 12.7.1 
- Wallet: Metamask
- Browser: Google Chrome Version 120.0.6099.109 (Official Build) (x86_64)

Anything else?

Issue is not reproducible on https://wormhole-connect-mainnet.netlify.app/. Warning to register asset is not displayed when sending USDC from Avalanche to Fantom. Transaction is successfully started from the first attempt.

Transaction can be successfully completed on https://preview.portalbridge.com/7102d8ccad/ if user clicks on "Approve and proceed with transaction" or Claim button several times.

[mliu-xlabs]

I dont think this is an issue anymore since fantom released a NTT variant of USDC