NSBackgroundActivityScheduler running too soon

I have an array of activities that need to be run at a specific time. The run in a background helper app. The array is sorted on date/time.

At 12:08:51 I add a new item in the array.. to run at 12:12. Upon creation the array is sorted again and the closest is added as an activity to a NSBackgroundActivityScheduler.

However it runs at creation and a few times more before 12:12. The next automation Normal doesn't run at creation as activity (activity Normal is already in the array of activities).

Why is this happening? And how can I fix it?


Log:

Code Block 
12:08:34.272494+0200	Started Automation Activity
12:08:34.276633+0200	Next Automation Normal on 2021-04-15 08:50:00 +0000
12:08:51.550121+0200	Started Automation Activity
12:08:51.554565+0200	Next Automation Test1212 on 2021-04-14 10:12:00 +0000
12:08:51.755904+0200	Automation Test1212 is running
12:08:51.756135+0200	Changing to ID DFA4B3D5-3D6C-4F47-A740-7F8C2D6FB30D
12:08:57.040569+0200	Prepare for next automation
12:08:57.040641+0200	Stopped Automation Activity
12:08:57.040829+0200	Started Automation Activity
12:08:57.047549+0200	Next Automation Test1212 on 2021-04-14 10:12:00 +0000
12:09:04.400019+0200	Started Automation Activity
12:09:04.404916+0200	Next Automation Test1212 on 2021-04-14 10:12:00 +0000
12:10:29.600003+0200	Automation Test1212 is running
12:10:29.600073+0200	Changing to ID DFA4B3D5-3D6C-4F47-A740-7F8C2D6FB30D
12:10:35.269521+0200	Prepare for next automation
12:10:35.269598+0200	Stopped Automation Activity
12:10:35.269763+0200	Started Automation Activity
12:10:35.275532+0200	Next Automation Test1212 on 2021-04-14 10:12:00 +0000
12:11:20.557440+0200	Automation Test1212 is running
12:11:20.557496+0200	Changing to ID DFA4B3D5-3D6C-4F47-A740-7F8C2D6FB30D
12:11:26.154006+0200	Prepare for next automation
12:11:26.154087+0200	Stopped Automation Activity
12:11:26.154256+0200	Started Automation Activity
12:11:26.161030+0200	Next Automation Test1212 on 2021-04-14 10:12:00 +0000
12:12:10.062696+0200	Automation Test1212 is running
12:12:10.062803+0200	Changing to RuleSetID DFA4B3D5-3D6C-4F47-A740-7F8C2D6FB30D
12:12:15.658318+0200	Prepare for next automation
12:12:15.658471+0200	Stopped Automation Activity
12:12:15.658667+0200	Started Automation Activity
12:12:15.664819+0200	Next Automation Normal on 2021-04-15 08:50:00 +0000

Code:

Code Block 
func nextAutomationFireDate() {
				let moc = CoreDataStorage.shared.persistentContainer.viewContext
				let automationDataRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "AutomationDB")
				do {
						var automations: [AutomationDB] = []
						automations.removeAll()
						// swiftlint:disable force_cast
						automations = try moc.fetch(automationDataRequest) as! [AutomationDB]
						let now = Date()
						var automationItems: [AutomationStruct] = []
						automationItems.removeAll()
						// automations is an array from the users database... automationItems is an activity array. I cut this part because its not needed for the question
						// Sort automations array on date
						let sortedAutomationItems = automationItems.sorted(by: { (lhs, rhs) -> Bool in
								return lhs.date < rhs.date
						})
						let nextAutomation = sortedAutomationItems[0]
						let secondsBetweenNowAndNextAutomation = nextAutomation.date.timeIntervalSince(now)
						self.log.content(category: "Background Task", message: "Next Automation \(nextAutomation.title) on \(nextAutomation.date)")
						automationActivity.invalidate()
						automationActivity.interval = secondsBetweenNowAndNextAutomation
						automationActivity.repeats = false
						automationActivity.qualityOfService = QualityOfService.userInitiated
						automationActivity.schedule {(completion: NSBackgroundActivityScheduler.CompletionHandler) in
								self.isBackgroundAutomationTaskRunning = true
								self.log.content(category: "Background Task", message: "Automation \(nextAutomation.title) is running")
								// do something
								self.runAutomation(nextAutomation)
								// schedule next fire date
								DispatchQueue.main.asyncAfter(deadline: .now() + 5.0) {
										NotificationCenter.default.post(name: .automationComplete, object: nil, userInfo: nil)
								}
								completion(NSBackgroundActivityScheduler.Result.finished)
						}
				} catch {
						log.content(category: "Automations", message: "Failed to fetch AutomationDB items: \(error)")
				}
		}