Build variants select wrong Firebase projects.

Quick solution:

app /src/ staging / google - services . json

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When an Android continuous integration pipeline compiles multiple product flavors or build variants, the Google Services Gradle plugin can inadvertently bind production credentials to staging builds or vice versa, causing unexpected data leakage or runtime initialization failures. This issue typically surfaces when developers rely on a single global configuration file or misconfigure directory structures for variant-specific JSON credentials, leading to mismatched client package names during compilation.

How the Plugin Chooses the Matching Client

Understanding the matching mechanism requires examining how the Google Services Gradle plugin processes files during compilation.…