[Android Software Development] KonstaT:
There's some missing privapp-permissions that need to be whitelisted on ARM 10.0 Android TV gapps or you're stuck in a bootloop otherwise.

On open_gapps-arm-10.0-tvstock-20200714 that was the latest until recently com.google.android.apps.mediashell needs android.permission.START_ACTIVITIES_FROM_BACKGROUND.

08-10 14:34:59.605 1212 1212 E System : ******************************************
08-10 14:34:59.605 1212 1212 E System : ************ Failure starting system services
08-10 14:34:59.605 1212 1212 E System : java.lang.IllegalStateException: Signature|privileged permissions not in privapp-permissions whitelist: {com.google.android.apps.mediashell: android.permission.START_AC
TIVITIES_FROM_BACKGROUND}
08-10 14:34:59.605 1212 1212 E System : at com.android.server.pm.permission.PermissionManagerService.systemReady(PermissionManagerService.java:2970)
08-10 14:34:59.605 1212 1212 E System : at com.android.server.pm.permission.PermissionManagerService.access$100(PermissionManagerService.java:122)
08-10 14:34:59.605 1212 1212 E System : at com.android.server.pm.permission.PermissionManagerService$PermissionManagerServiceInternalImpl.systemReady(PermissionManagerService.java:3031)
08-10 14:34:59.605 1212 1212 E System : at com.android.server.pm.PackageManagerService.systemReady(PackageManagerService.java:21883)
08-10 14:34:59.605 1212 1212 E System : at com.android.server.SystemServer.startOtherServices(SystemServer.java:2037)
08-10 14:34:59.605 1212 1212 E System : at com.android.server.SystemServer.run(SystemServer.java:529)
08-10 14:34:59.605 1212 1212 E System : at com.android.server.SystemServer.main(SystemServer.java:356)
08-10 14:34:59.605 1212 1212 E System : at java.lang.reflect.Method.invoke(Native Method)
08-10 14:34:59.605 1212 1212 E System : at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:491)
08-10 14:34:59.605 1212 1212 E System : at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:918)
08-10 14:34:59.605 1212 1212 D SystemServerTiming: MakePackageManagerServiceReady took to complete: 426ms
08-10 14:34:59.606 1212 1212 E Zygote : System zygote died with exception
08-10 14:34:59.606 1212 1212 E Zygote : java.lang.IllegalStateException: Signature|privileged permissions not in privapp-permissions whitelist: {com.google.android.apps.mediashell: android.permission.START_AC
TIVITIES_FROM_BACKGROUND}
08-10 14:34:59.606 1212 1212 E Zygote : at com.android.server.pm.permission.PermissionManagerService.systemReady(PermissionManagerService.java:2970)
08-10 14:34:59.606 1212 1212 E Zygote : at com.android.server.pm.permission.PermissionManagerService.access$100(PermissionManagerService.java:122)
08-10 14:34:59.606 1212 1212 E Zygote : at com.android.server.pm.permission.PermissionManagerService$PermissionManagerServiceInternalImpl.systemReady(PermissionManagerService.java:3031)
08-10 14:34:59.606 1212 1212 E Zygote : at com.android.server.pm.PackageManagerService.systemReady(PackageManagerService.java:21883)
08-10 14:34:59.606 1212 1212 E Zygote : at com.android.server.SystemServer.startOtherServices(SystemServer.java:2037)
08-10 14:34:59.606 1212 1212 E Zygote : at com.android.server.SystemServer.run(SystemServer.java:529)
08-10 14:34:59.606 1212 1212 E Zygote : at com.android.server.SystemServer.main(SystemServer.java:356)
08-10 14:34:59.606 1212 1212 E Zygote : at java.lang.reflect.Method.invoke(Native Method)
08-10 14:34:59.606 1212 1212 E Zygote : at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:491)
08-10 14:34:59.606 1212 1212 E Zygote : at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:918)
08-10 14:34:59.606 1212 1212 D AndroidRuntime: Shutting down VM
08-10 14:34:59.607 1212 1212 E AndroidRuntime: *** FATAL EXCEPTION IN SYSTEM PROCESS: main
08-10 14:34:59.607 1212 1212 E AndroidRuntime: java.lang.IllegalStateException: Signature|privileged permissions not in privapp-permissions whitelist: {com.google.android.apps.mediashell: android.permission.ST
ART_ACTIVITIES_FROM_BACKGROUND}
08-10 14:34:59.607 1212 1212 E AndroidRuntime: at com.android.server.pm.permission.PermissionManagerService.systemReady(PermissionManagerService.java:2970)
08-10 14:34:59.607 1212 1212 E AndroidRuntime: at com.android.server.pm.permission.PermissionManagerService.access$100(PermissionManagerService.java:122)
08-10 14:34:59.607 1212 1212 E AndroidRuntime: at com.android.server.pm.permission.PermissionManagerService$PermissionManagerServiceInternalImpl.systemReady(PermissionManagerService.java:3031)
08-10 14:34:59.607 1212 1212 E AndroidRuntime: at com.android.server.pm.PackageManagerService.systemReady(PackageManagerService.java:21883)
08-10 14:34:59.607 1212 1212 E AndroidRuntime: at com.android.server.SystemServer.startOtherServices(SystemServer.java:2037)
08-10 14:34:59.607 1212 1212 E AndroidRuntime: at com.android.server.SystemServer.run(SystemServer.java:529)
08-10 14:34:59.607 1212 1212 E AndroidRuntime: at com.android.server.SystemServer.main(SystemServer.java:356)
08-10 14:34:59.607 1212 1212 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
08-10 14:34:59.607 1212 1212 E AndroidRuntime: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:491)
08-10 14:34:59.607 1212 1212 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:918)

On open_gapps-arm-10.0-tvstock-20200820 more permissions are needed. com.google.android.tvrecommendations also needs android.permission.START_ACTIVITIES_FROM_BACKGROUND.

08-15 09:56:06.615 823 823 E System : ******************************************
08-15 09:56:06.615 823 823 E System : ************ Failure starting system services
08-15 09:56:06.615 823 823 E System : java.lang.IllegalStateException: Signature|privileged permissions not in privapp-permissions whitelist: {com.google.android.tvrecommendations: android.permission.START_
ACTIVITIES_FROM_BACKGROUND}
08-15 09:56:06.615 823 823 E System : at com.android.server.pm.permission.PermissionManagerService.systemReady(PermissionManagerService.java:2970)
08-15 09:56:06.615 823 823 E System : at com.android.server.pm.permission.PermissionManagerService.access$100(PermissionManagerService.java:122)
08-15 09:56:06.615 823 823 E System : at com.android.server.pm.permission.PermissionManagerService$PermissionManagerServiceInternalImpl.systemReady(PermissionManagerService.java:3031)
08-15 09:56:06.615 823 823 E System : at com.android.server.pm.PackageManagerService.systemReady(PackageManagerService.java:21883)
08-15 09:56:06.615 823 823 E System : at com.android.server.SystemServer.startOtherServices(SystemServer.java:2037)
08-15 09:56:06.615 823 823 E System : at com.android.server.SystemServer.run(SystemServer.java:529)
08-15 09:56:06.615 823 823 E System : at com.android.server.SystemServer.main(SystemServer.java:356)
08-15 09:56:06.615 823 823 E System : at java.lang.reflect.Method.invoke(Native Method)
08-15 09:56:06.615 823 823 E System : at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:491)
08-15 09:56:06.615 823 823 E System : at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:918)
08-15 09:56:06.615 823 823 D SystemServerTiming: MakePackageManagerServiceReady took to complete: 404ms
08-15 09:56:06.615 823 823 E Zygote : System zygote died with exception
08-15 09:56:06.615 823 823 E Zygote : java.lang.IllegalStateException: Signature|privileged permissions not in privapp-permissions whitelist: {com.google.android.tvrecommendations: android.permission.START_
ACTIVITIES_FROM_BACKGROUND}
08-15 09:56:06.615 823 823 E Zygote : at com.android.server.pm.permission.PermissionManagerService.systemReady(PermissionManagerService.java:2970)
08-15 09:56:06.615 823 823 E Zygote : at com.android.server.pm.permission.PermissionManagerService.access$100(PermissionManagerService.java:122)
08-15 09:56:06.615 823 823 E Zygote : at com.android.server.pm.permission.PermissionManagerService$PermissionManagerServiceInternalImpl.systemReady(PermissionManagerService.java:3031)
08-15 09:56:06.615 823 823 E Zygote : at com.android.server.pm.PackageManagerService.systemReady(PackageManagerService.java:21883)
08-15 09:56:06.615 823 823 E Zygote : at com.android.server.SystemServer.startOtherServices(SystemServer.java:2037)
08-15 09:56:06.615 823 823 E Zygote : at com.android.server.SystemServer.run(SystemServer.java:529)
08-15 09:56:06.615 823 823 E Zygote : at com.android.server.SystemServer.main(SystemServer.java:356)
08-15 09:56:06.615 823 823 E Zygote : at java.lang.reflect.Method.invoke(Native Method)
08-15 09:56:06.615 823 823 E Zygote : at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:491)
08-15 09:56:06.615 823 823 E Zygote : at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:918)
08-15 09:56:06.615 823 823 D AndroidRuntime: Shutting down VM
08-15 09:56:06.616 823 823 E AndroidRuntime: *** FATAL EXCEPTION IN SYSTEM PROCESS: main
08-15 09:56:06.616 823 823 E AndroidRuntime: java.lang.IllegalStateException: Signature|privileged permissions not in privapp-permissions whitelist: {com.google.android.tvrecommendations: android.permission.
START_ACTIVITIES_FROM_BACKGROUND}
08-15 09:56:06.616 823 823 E AndroidRuntime: at com.android.server.pm.permission.PermissionManagerService.systemReady(PermissionManagerService.java:2970)
08-15 09:56:06.616 823 823 E AndroidRuntime: at com.android.server.pm.permission.PermissionManagerService.access$100(PermissionManagerService.java:122)
08-15 09:56:06.616 823 823 E AndroidRuntime: at com.android.server.pm.permission.PermissionManagerService$PermissionManagerServiceInternalImpl.systemReady(PermissionManagerService.java:3031)
08-15 09:56:06.616 823 823 E AndroidRuntime: at com.android.server.pm.PackageManagerService.systemReady(PackageManagerService.java:21883)
08-15 09:56:06.616 823 823 E AndroidRuntime: at com.android.server.SystemServer.startOtherServices(SystemServer.java:2037)
08-15 09:56:06.616 823 823 E AndroidRuntime: at com.android.server.SystemServer.run(SystemServer.java:529)
08-15 09:56:06.616 823 823 E AndroidRuntime: at com.android.server.SystemServer.main(SystemServer.java:356)
08-15 09:56:06.616 823 823 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
08-15 09:56:06.616 823 823 E AndroidRuntime: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:491)
08-15 09:56:06.616 823 823 E AndroidRuntime: at com.android.internal.o[ 159.042450] healthd: battery none chg=a

Users are also reporting being stuck in bootloop with ARM 10.0 pico package but I haven't checked the logs yet. Edit. tested open_gapps-arm-10.0-pico-20200822 and it works fine. Probably just some user error people ran into.