SubversionSCMSource$ListenerImpl onNotify only checks that the UUID of the notification matches the UUID of a SubversionSCMSource instance before telling a multibranch pipeline to execute a branch index. SubversionSCMSource.java#L1043

In the case of a Subversion repo that hosts multiple projects this causes all projects using the same repo to trigger a branch index.

This behavior is inconsistent with what SubversionRepositoryStatus$JobTriggerListenerImpl onNotify does for other job types. SubversionRepositoryStatus.java#L271