[Bug]: Multichain - MetaMask unresponsive after adding and switching networks from a dapp

[seaona]

Describe the bug

Problem: whenever I add a netowrk from a dapp, MetaMask stays unresponsive and I see an empty error in the background. If I reload MetaMask I see how the network was not added and I remain in the previous selected network.

• This is not happening in prod 11.9.4
• Furthermore, this is not happening if I add this same network manually
• The error appears independently of having the Select networks for each site enabled or disabled - makes no difference

Expected behavior

MetaMask should switch networks and continue to work. I am able to do it in prod

Screenshots/Recordings

https://github.com/MetaMask/metamask-extension/assets/54408225/b838f6d1-77a8-432b-a75c-8b20341a0a7d

Steps to reproduce

1. Go to chainlist https://chainlist.org/?testnets=true&search=bsc
2. Connect MM
3. Add a Network Binance Testnet
4. Approve
5. Switch networks
6. Click again the MM icon--- see it's unresponsive, see error in the background

Error messages or log output

No response

Version

develop - with multichain flag

Build type

None

Browser

Chrome

Operating system

Linux

Hardware wallet

No response

Additional context

No response

Severity

No response

[shanejonas]

@seaona this is only with the request queuing toggled on right?

[darkwing]

This does not appear to be related to send flow.

[seaona]

@darkwing that's correct. After investigating further with Shane and Alex, we've seen that this is the same issue as this one https://github.com/MetaMask/metamask-extension/issues/21929 which was already present before. From slack: it might be that the work on the area of queuing multichain fixes this one