Hello everyone, I’ve been using GrowthBook DevTools for my application, and it has always updated the UI immediately and worked flawlessly for years. Recently, I upgraded

react

and

react-dom

from version

v18.3.1

to the latest stable

v19.2.0

, and

next

from

v14

to

v15

. After that, the UI stopped updating in my local development server. I tried downgrading only the NextJs version back to

v14

, but the issue persisted. The UI updates correctly only when I revert both

react

and

react-dom

to version

18.3.1

. I investigated to find out when the issue first appeared, and it seems that starting from version 19.0.0-beta-4508873393-20240430. The local development version no longer responds to overridden value changes via GrowthBook DevTools, while the locally built version still works as expected. Thanks in advance.

Hey thanks for the report! So if I understand, it seems like the update to React/React DOM 19 is causing dev tools to no longer work. But it still works when you build locally?

Thanks for the reply. Yes, Absolutely correct 👍 The feature flag value changing no longer updates UI only for local dev server

Thanks. There must be something in the new React version. I'll see if I can debug.

Thanks for trying! Is there anything I can provide that makes debugging easier?

I spun up a React 19 project and I couldn't replicate. I still need to try a Next.js project with React 19.