Android Question About the MyLocation app

I noticed one curious thing about the MyLocation type of application.
It started with the fact that I decided to write an application that runs in the background like MyLocation.

Let's say we have the following lines in a test program.

1. Module "Main".
Sub Activity_Resume
    StartService (Tracker)
End Sub

2. Module "Starter"
#Region Service Attributes
    #StartAtBoot: False
#End Region

3. Module "Tracker"
#Region Service Attributes
    #StartAtBoot: True
#End Region

Sub Process_Globals
    Private lock As PhoneWakeState
    Private mp As MediaPlayer
    Private Timer_Alarm As Timer
End Sub

Sub Service_Create
    Service.AutomaticForegroundMode = Service.AUTOMATIC_FOREGROUND_NEVER
    Timer_Alarm.Initialize ("Timer_Alarm", 10000)
    Timer_Alarm.Enabled = True
End Sub

Sub Service_Start (StartingIntent As Intent)
    Service.StartForeground (nid, CreateNotification ("..."))
End Sub

Sub Timer_Alarm_Tick
    If Not (mp.IsInitialized) Then
        mp.Initialize ()
    End If
    mp.Load (File.DirAssets, "sound.mp3")
End Sub

Sub CreateNotification (Body As String) As Notification
    Dim notification As Notification
    notification.Initialize2 (notification.IMPORTANCE_LOW)
    notification.Icon = "icon"
    notification.SetInfo ("Hello!", Body, Main)
    Return notification
End Sub

It really works stably if in the "Starter" module:
#StartAtBoot: False

But, if we indicate here:
#StartAtBoot: True

then when the device is restarted, the application no longer works: the timer in the "Tracker" module does not work!

But I have a question: after all, the "Starter" service should ALWAYS start when the device is rebooted?
Or it turns out here that if both services - "Stater" and "Tracker" - indicate
#StartAtBoot: True

then "Starter" really starts, but there are no executable commands in it, and the launch of "Tracker" is ignored?

At the same time, if you specify in the "Starter" module:
#StartAtBoot: False

then in this case the "Tracker" module is actually launched and the timer is triggered.

Is this so, please explain!

Very grateful in advance.