Hi,
I installed the demo locally, replacing the .env config with the following test stream.
GATSBY_GA_MEASUREMENT_ID=G-76J7BRMJ6F
After doing so and running Gatbsy Build && Gatsby Serve, no data is reported in GA4.
Steps to Reproduce
Install Project
Duplicate .env-example as .env
Add real ga4 ID to the variable
Run Gatsby Build && Gatbsy Server
Check GA4, don't see anything
See a 404 on the Third-party Proxy / Happens both locally with demo site, and with inprogress site on Gatsby Cloud.
I originally started this process on an in-progress site, but since it's running preact 10 .11 instead of React 18/17. I thought I'd give this a shot.