Storekit failing in TestFlight builds, but working in the App store

It seems that recently all the subscription/price info that we get from Storekit is missing from our TestFlight builds. I'm pretty sure that this is a Storekit issue, not an issue in the app's code, since we're seeing this bug in TF builds for the last production release, but not in the App store version using the same build.

Has anyone seen this behaviour in their apps on TestFlight?