Oppo Realme1 Job Schduler Min interval for Periodic Work is 1 hr

Currently I am using WorkManager 1.0.0-alpha05. I set periodic Work Request using below code. When interval is below 1 hr then In Oppo Realme (Android Version - 8.1.0 , ColorOSVersion V5.0) job execute at 1 hr. When interval greater than 1 hr job execute at exact time . when interval is smaller than 1 hr then job execute at 1 hr.

Please let me know any log or information required :

Code For Schdule Periodic Job:

PeriodicWorkRequest uploadWork = new PeriodicWorkRequest.
                Builder(LocationUpdatesJobService.class ,interval, TimeUnit.MILLISECONDS)
                .addTag(Constants.Location.TAG_BACKGROUND_LOCATION_PERIODIC)
                .setConstraints(constraints).build();
            WorkManager.getInstance().enqueueUniquePeriodicWork(
                    Constants.Location.TAG_BACKGROUND_LOCATION_PERIODIC,
                    ExistingPeriodicWorkPolicy.REPLACE, uploadWork);

in all other device Periodic Work request interval is proper. In Oppo Realme 1 work execute at 1 hr.

Oppo Realme 1: Interval 15 Min

I debug Job Schduler using below command: adb shell dumpsys jobscheduler

JOB #u0a249/18: cc2fc59 com.cygneto.field_sales/androidx.work.impl.background.systemjob.SystemJobService
u0a249 tag=job/com.cygneto.field_sales/androidx.work.impl.background.systemjob.SystemJobService
Source: uid=u0a249 user=0 pkg=com.cygneto.field_sales
JobInfo:
Service: com.cygneto.field_sales/androidx.work.impl.background.systemjob.SystemJobService
PERIODIC: interval=+1h0m0s0ms flex=+21m0s0ms
Requires: charging=false batteryNotLow=false deviceIdle=false
Extras: mParcelledData.dataSize=180
Backoff: policy=1 initial=+30s0ms
Has early constraint
Has late constraint
Required constraints: TIMING_DELAY DEADLINE
Satisfied constraints: APP_NOT_IDLE DEVICE_NOT_DOZING
Unsatisfied constraints: TIMING_DELAY DEADLINE
Doze whitelisted: true
Tracking: TIME
Enqueue time: -9m4s617ms
Run time: earliest=+29m55s383ms, latest=+50m55s383ms
Ready: false (job=false user=true !pending=true !active=true !backingup=true comp=true)

Oppo Realme 1: Interval 1hr 10 Min

Log:

JobInfo:
Service: com.cygneto.field_sales/androidx.work.impl.background.systemjob.SystemJobService
PERIODIC: interval=+1h10m0s0ms flex=+1h10m0s0ms
Requires: charging=false batteryNotLow=false deviceIdle=false
Extras: mParcelledData.dataSize=180
Doze whitelisted: true
Tracking: TIME
Enqueue time: -4m19s846ms
Run time: earliest=+1h5m39s833ms, latest=+2h15m39s833ms
Last successful run: 2018-07-25 17:01:23
Ready: false (job=false user=true !pending=true !active=true !backingup=true comp=true)

Other Device :

Log :

JobInfo:
Service:com.cygneto.field_sales/androidx.work.impl.background.systemjob.SystemJobService
    PERIODIC: interval=+15m0s0ms flex=+15m0s0ms
    Requires: charging=false batteryNotLow=false deviceIdle=false
    Tracking: TIME
    Enqueue time: -29s237ms
    Run time: earliest=+14m30s690ms, latest=+29m30s690ms
    Last successful run: 2018-07-25 17:29:19
    Ready: false (job=false user=true !pending=true !active=true !backingup=true comp=true)

I also try Using different library. I found same behavior in Job Scheduler and Android-Job. job period length is 15 min but execute at 1 hr but when i try using firebase job dispatcher job execute at correct 15 min interval time.

i debug Job Scheduler and Android-Job using below command: adb shell dumpsys jobscheduler

Job Scheduler:

Interval : 15 Min Output : 1 hr

Log:

JOB #u0a266/1: a0dd846 com.jobscheduler_periodic/com.periodic.JobSchedulerService
    u0a266 tag=*job*/com.jobscheduler_periodic/com.periodic.JobSchedulerService
    Source: uid=u0a266 user=0 pkg=com.jobscheduler_periodic
    JobInfo:
      Service: com.jobscheduler_periodic/com.periodic.JobSchedulerService
      PERIODIC: interval=+1h0m0s0ms flex=+15m0s0ms

Android-Job:

Interval : 15 Min Output : 1 hr:

Log:

JOB #u0a266/3: 10c0d65 com.jobscheduler_periodic/com.evernote.android.job.v21.PlatformJobService
    u0a266 tag=*job*/com.jobscheduler_periodic/com.evernote.android.job.v21.PlatformJobService
    Source: uid=u0a266 user=0 pkg=com.jobscheduler_periodic
    JobInfo:
      Service: com.jobscheduler_periodic/com.evernote.android.job.v21.PlatformJobService
      PERIODIC: interval=+1h0m0s0ms flex=+5m0s0ms

Firebase Job Dispatcher:

I debug firebase job Dispatcher using below command: adb shell "dumpsys activity service GcmService | grep com.jobscheduler_periodic"

Interval : 15 Min Output : 15 min

Log:

u0|com.jobscheduler_periodic: 1
    (scheduled) com.jobscheduler_periodic/com.firebase.jobdispatcher.GooglePlayReceiver{u=0 tag="MyJobService" trigger=window{s
tart=720s,end=900s,earliest=46s,latest=226s} requirements=[NET_CONNECTED,CHARGING] attributes=[RECURRING] scheduled=-673s last_
run=N/A jid=N/A status=PENDING retries=0 client_lib=FIREBASE_JOB_DISPATCHER-1}

This happens to be an OEM bug. Unfortunately, it is very hard to work around these kind of bugs, in a battery efficient way. If you want a period of 15 mins, I suggest using the following workaround:

Use a OneTimeWorkRequest instead of a periodic work request, and upon first execution of the first work request, schedule a second from inside the worker with an initialDelay of 15 mins. That will essentially give you what you want.