[OnePlus 6 Guides, News, & Discussion] lazye53:
This also has been tried on my debloat 10.3.0 and 10.3.1 runs smoothly.

If it works, please click the thank you button. :p

dumpsys deviceidle enable
dumpsys deviceidle force-idle
pm uninstall --user 0 com.google.android.marvin.talkback
pm uninstall --user 0 com.google.android.projection.gearhead
pm uninstall --user 0 com.dsi.ant.server
pm uninstall --user 0 com.google.ar.core
pm uninstall --user 0 com.android.backup
pm uninstall --user 0 com.oneplus.backuprestore.remoteservice
pm uninstall --user 0 com.android.dreams.basic
pm uninstall --user 0 com.android.bluetoothmidiservice
pm uninstall --user 0 com.oneplus.bttestmode
pm uninstall --user 0 com.android.bookmarkprovider
pm uninstall --user 0 com.oneplus.opbugreportlite
pm uninstall --user 0 net.oneplus.commonlogtool
pm uninstall --user 0 com.android.bips
pm uninstall --user 0 com.oneplus.factorymode.specialtest
pm uninstall --user 0 com.oneplus.factorymode
pm uninstall --user 0 com.oneplus.gamespace
pm uninstall --user 0 com.google.android.apps.walletnfcrel
pm uninstall --user 0 com.android.wallpaper.livepicker
pm uninstall --user 0 com.oem.logkitsdservice
pm uninstall --user 0 com.oem.nfc
pm uninstall --user 0 cn.oneplus.nvbackup
pm uninstall --user 0 cn.oneplus.oem_tcma
pm uninstall --user 0 com.oneplus.account
pm uninstall --user 0 com.oneplus.wallpaper
pm uninstall --user 0 com.android.wallpaperbackup
pm uninstall --user 0 cn.oneplus.oemtcma
pm uninstall --user 0 com.oem.oemlogkit
pm uninstall --user 0 com.tencent.soter.soterserver
pm uninstall --user 0 com.android.egg
pm uninstall --user 0 com.android.providers.partnerbookmarks
pm uninstall --user 0 com.google.android.printservice.recommendation
pm uninstall --user 0 net.oneplus.push
pm uninstall --user 0 com.oem.rftoolkit
pm uninstall --user 0 com.example.rftuner
pm uninstall --user 0 com.fingerprints.fingerprintsensortest
pm uninstall --user 0 cn.oneplus.photos
pm uninstall --user 0 com.android.traceur
pm uninstall --user 0 com.example.wifirftest
pm uninstall --user 0 android.autoinstalls.config.oneplus
pm uninstall --user 0 com.qti.diagservices
pm uninstall --user 0 com.android.stk
pm uninstall --user 0 com.android.backupconfirm
pm uninstall --user 0 com.android.calllogbackup
pm uninstall --user 0 com.android.musicfx
pm uninstall --user 0 com.android.hotwordenrollment.okgoogle
pm uninstall --user 0 com.gsma.rcs
pm uninstall --user 0 com.google.android.tag
pm uninstall --user 0 com.android.hotwordenrollment.xgoogle
pm uninstall --user 0 com.google.android.apps.docs
pm uninstall --user 0 com.google.android.apps.tachyon
pm uninstall --user 0 com.google.dreams.phototable
pm uninstall --user 0 com.qualcomm.qti.remoteSimlockAuth
pm uninstall --user 0 com.google.android.googlequicksearchbox
pm uninstall --user 0 com.google.android.gm
pm uninstall --user 0 com.google.android.music
pm uninstall --user 0 com.android.wallpapercropper
pm uninstall --user 0 com.google.android.feedback
pm uninstall --user 0 com.google.android.videos
pm uninstall --user 0 com.oneplus.card
pm uninstall --user 0 com.google.android.tts
pm uninstall --user 0 com.oem.autotest
pm uninstall --user 0 com.qti.snapdragon.qdcm_ff
pm uninstall --user 0 com.qualcomm.uimremoteclient
pm uninstall --user 0 com.wapi.wapicertmanage
pm uninstall --user 0 com.oneplus.brickmode
pm uninstall --user 0 com.amazon.avod.thirdpartyclient
pm uninstall --user 0 com.amazon.kindle
pm uninstall --user 0 com.amazon.mShop.android.shopping
pm uninstall --user 0 com.google.android.apps.photos
pm uninstall --user 0 com.google.android.apps.restore
pm uninstall --user 0 com.google.android.apps.turbo
pm uninstall --user 0 com.google.android.calendar
pm uninstall --user 0 com.google.android.onetimeinitializer
pm uninstall --user 0 com.google.android.setupwizard
pm uninstall --user 0 com.netflix.mediaclient
pm uninstall --user 0 com.netflix.partner.activation
pm uninstall --user 0 com.oneplus.backuprestore
pm uninstall --user 0 net.oneplus.forums
pm uninstall --user 0 com.oneplus.iconpack.circle
pm uninstall --user 0 com.oneplus.iconpack.oneplus
pm uninstall --user 0 com.oneplus.iconpack.square
pm uninstall --user 0 in.amazon.mShop.android.shopping
pm uninstall --user 0 net.oneplus.odm
pm uninstall --user 0 net.oneplus.odm.provider
pm uninstall --user 0 net.oneplus.provider.appcategoryprovider
settings delete global device_idle_constants
settings put global device_idle_constants inactive_to=30000,sensing_to=0,locating_to=0,location_accuracy=20.0,motion_inactive_to=0,idle_after_inactive_to=0,idle_pending_to=300000,max_idle_pending_to=600000,idle_pending_factor=2.0,idle_to=3600000,max_idle_to=21600000,idle_factor=2.0,min_time_to_alarm=3600000,max_temp_app_whitelist_duration=300000,mms_temp_app_whitelist_duration=60000,sms_temp_app_whitelist_duration=20000