how can in configure firebase testing groups per productFlavor in gradle file

Question

i have a problem with my android gradle build script. We use Firebase AppDistribution to invite testers. The goal is to publish the new development version via Jenkins and each product flavor has it's own Firebase Tester group. With this approach, we edit only the group in firebase and our build pipeline is not affected.

android {
    productFlavors {
        dev1 {
           dimension "stage"
            snapshotPublisher {
                firebaseAppDistribution {
                    distributionGroupAliases = "dev1-tester"
                }
            }
        }
        dev2 {
           dimension "stage"
            snapshotPublisher {
                firebaseAppDistribution {
                    distributionGroupAliases = "dev2-tester"
                }
            }
        }
...

and the default configuration for snapshotPublisher

snapshotPublisher {
    firebaseAppDistribution {
        serviceAccountCredentials = "firebase-service-account.json"
        distributionGroupAliases = "default-tester"
    }

But it seems the snapshotPublisher use always the group from the last flavor

flavor	command	Testers group	expected testers group
dev1	\gradlew publishSnapshotFirebaseAppDistributionDev1Debug	dev2-tester	dev1-tester
dev2	\gradlew publishSnapshotFirebaseAppDistributionDev2Debug	dev2-tester	dev2-tester

Does anybody has a hint for me, or a different approach?

Thanks in advance!

Bernhard