Phantom on mainnet mode successfully signAndSend transactions while app is using a testnet

[phoenixVS]

When Phantom on mainnet mode and app is using test- devnet, you can sign
and send transactions with wallet using signAndSendTransactions and it even returns
some transaction hash which is not present in solscan

To Reproduce
Steps to reproduce the behavior:

1. Go to https://lab.web3modal.com/library/solana/
2. Disable testnet mode in phantom and connect
3. select test | dev net and run Sign and Send transaction (both V0 and legacy ones)
4. You recieve a signature instead of thowing some error

Expected behavior
It should throw some error instead

Screenshots

Desktop (please complete the following information):

• OS: Windows
• Browser chrome
• Versions:
  "@solana/wallet-adapter-base": "0.9.23",
  "@solana/wallet-adapter-phantom": "0.9.24"

Additional context
(i.e. if you run devnet trx in testnet mode - it gives an error)

[jordaaash]

Please report issues with Phantom to Phantom. Also, using an adapter for Phantom generally won't be necessary, since it supports the Wallet Standard. If a transaction hash isn't found in an explorer, make sure you're using the same cluster in the app, wallet settings, and explorer.