(nextjs) Metamask connector doesn't inject walletclients anymore

[elmariachi111]

Check existing issues

• I checked there isn't already an issue for the bug I encountered.

Describe the bug

Quite recently I observed, that when I'm connected with Metamask, the useWalletClient hook isn't providing its data. First noticed this while testing with MM on a Brave browser, and after the recent upgrade of Chrome to 142, I can also reproduce it there. I tested that within other environments and the issue seems to only occur when building on Nextjs (app router)

Link to Minimal Reproducible Example

https://demo-mm-privy-next-walletlcient-git-no-privy-welshare.vercel.app/

Steps To Reproduce

I created a repo & deployments to reproduce:

• https://github.com/elmariachi111/demo-mm-privy-next-walletlcient/tree/no-privy
• Deployed: https://demo-mm-privy-next-walletlcient.vercel.app/

also on Stackblitz, but that doesnt work easily out of the box with next (try running pnpm dev twice) -> https://stackblitz.com/~/github.com/elmariachi111/demo-mm-privy-next-walletlcient?file=package.json

It works fine with Phantom & Brave wallets.

Screen.Recording.2025-11-14.at.14.01.55.mov

What Wagmi package(s) are you using?

wagmi

Wagmi Package(s) Version(s)

2.19.2

Viem Version

2.38.6

TypeScript Version

5.9.3

Anything else?

Nextjs seems to be the deeper cause for this. It worked fine until ~3 weeks ago. Chrome, Metamask had been updated in the meanwhile.

[jaan1025]

same

[elmariachi111]

it is quite random, right? I first thought it might be related to Privy, and texted them. It rather seems to be rooted somewhere between Metamask, Brave, Next and Wagmi from my pov.

[hushino]

same, next 16, wagmi 3, in my case with chrome beta