New Patients not seen while running an app from scratch about android-fhir HOT 2 CLOSED

Patient list not appearing. In the logs I see:

2020-12-04 13:37:15.426 15138-15138/com.google.fhirengine.example D/PatientListViewModel: getSearchedPatients(): patientResults[0], searchedPatients[0]
2020-12-04 13:37:15.432 15138-15138/com.google.fhirengine.example D/PatientListActivity: Submitting 0 patient records
2020-12-04 13:37:15.438 15138-15138/com.google.fhirengine.example I/Choreographer: Skipped 272 frames! The application may be doing too much work on its main thread.
2020-12-04 13:37:15.519 15138-15169/com.google.fhirengine.example D/EGL_emulation: eglMakeCurrent: 0xdd41a1e0: ver 2 0 (tinfo 0xdd40f320)
2020-12-04 13:37:15.528 15138-15169/com.google.fhirengine.example I/OpenGLRenderer: Davey! duration=4628ms; Flags=1, IntendedVsync=30229110398020, Vsync=30233643731172, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=30233656548010, AnimationStart=30233656571046, PerformTraversalsStart=30233656932837, DrawStart=30233724334570, SyncQueued=30233731179053, SyncStart=30233738756191, IssueDrawCommandsStart=30233738817688, SwapBuffers=30233742544330, FrameCompleted=30233746002001, DequeueBufferDuration=379000, QueueBufferDuration=225000,
2020-12-04 13:37:15.529 15138-15169/com.google.fhirengine.example D/EGL_emulation: eglMakeCurrent: 0xdd41a1e0: ver 2 0 (tinfo 0xdd40f320)

2020-12-03 17:33:02.004 9502-9604/com.google.fhirengine.example D/OkHttp: --> GET http://hapi.fhir.org/baseR4?_getpages=51e4f072-c00d-417d-a239-2cdf673a15c0&_getpagesoffset=20&_count=20&_pretty=true&_bundletype=searchset
2020-12-03 17:33:02.004 9502-9604/com.google.fhirengine.example D/OkHttp: --> END GET
2020-12-03 17:33:02.007 9502-9604/com.google.fhirengine.example D/OkHttp: <-- HTTP FAILED: java.net.UnknownServiceException: CLEARTEXT communication to hapi.fhir.org not permitted by network security policy
2020-12-03 17:33:02.011 9502-9532/com.google.fhirengine.example I/WM-WorkerWrapper: Worker result FAILURE for Work [ id=f6277313-2f2d-4b86-80a8-6629ea461472, tags={ com.google.fhirengine.example.data.FhirPeriodicSyncWorker } ]

from android-fhir.

There seems to be a difference in ListActivity behaviour between API version 21 vs version 28.
Currently I'm not able to see Patient list on Ver 21, but works on Ver 28,
Trying to figure out more.

from android-fhir.