[Bug]: wallet_switchEthereumChain no longer returns Unrecognized chain ID and returns null instead

[christopherferreira9]

Describe the bug

Calling wallet_switchEthereumChain no longer returns Unrecognized chain ID if the chain hasn't been added before.

Expected behavior

Given that the chain wasn't added before it should return:

• Error 4902
• Unrecognized chain ID. Try adding the chain using wallet_addEthereumChain first.

See https://docs.metamask.io/wallet/reference/json-rpc-methods/wallet_switchethereumchain/

Screenshots/Recordings

No response

Steps to reproduce

1. Go to https://switch-chain-issue-m6vyexrc9-christopherferreira9s-projects.vercel.app/
2. Connect to the dapp
3. Without having Filecoin network added tap "switch to Filecoin"
4. see the console logs and look for the response log

Error messages or log output

No response

Detection stage

During release testing

Version

7.37.0

Build type

None

Device

iPhone 11

Operating system

iOS

Additional context

No response

Severity

No response

[Unik0rnMaggie]

Possibly related:

Error on Pancakeswap when switching networks on the dapp page. But the network is switched in the MetaMask app.

When trying to swap, error on dapp page and page needs to be reloaded in order for the swap to work.

Screen.Recording.2024-12-02.at.12.28.00.mov

[christopherferreira9]

Closing as it seems to not be applicable since the latest RC was created.