Gradle-based test execution produced zero appmaps

I clonsed https://github.com/spring-projects/spring-petclinic and executed the wizard to create tests for gradle test.

The final screen told me that 0 appmaps were created.
Maven-based test execution in the same repo produced 40 appmaps.

   ╭───────────────────────────────────────────────────────────────────────────────────────╮
   │                                                                                       │
   │                Success! There are now 0 AppMap files in directory '.'.                │
   │                                                                                       │
   │                                NEXT STEP: Open AppMaps                                │
   │                                                                                       │
   │   Return to the AppMap extension in your code editor to open and view your AppMaps.   │
   │                                                                                       │
   ╰───────────────────────────────────────────────────────────────────────────────────────╯

Reproduce the report in spring-petclinic by running the wizard for gradle test, then compare its result with the Maven-based execution that creates 40 AppMaps. Trace the Gradle test-execution entry point and determine why it reports zero files; done means the Gradle workflow creates AppMaps rather than displaying zero.