Unexpected behavior when there are multiple injected providers

[zeosamaster]

Steps to reproduce

1. Install & setup MetaMask
2. Install & setup another injected wallet (e.g. CoinbaseWallet)
3. const provider = await detectEthereumProvider({ mustBeMetaMask: true })
4. await provider.request({ method: 'eth_requestAccounts' })

Expected behavior

1. MetaMask wallet prompts for connection
2. CoinbaseWallet does not prompt for connection

Actual behavior

1. MetaMask wallet prompts for connection
2. CoinbaseWallet prompts for connection