No motion events on HomeKit at all since upgrade to Protect 1.16.9 on UDM-Pro
**Describe The Problem:**
No motion events on HomeKit at all since upgrade to Protect 1.16.9 on UDM-Pro. 

**To Reproduce:**
Trigger motion in front of G4 Doorbell. Motion alerts come from UniFi Protect app on iOS, but not from HomeKit. Snapshots and video streams work fine. 

**Logs:**
No relevant logs can be seen in Homebridge

**Homebridge Configuration:**

```json
            "controllers": [
                {
                    "address": "X.X.X.X",
                    "password": "XXXXXXXXXXXX",
                    "username": "XXXXXXXXXXXX"
                }
            ],
            "options": [
                "Disable.Motion.Switch",
                "Disable.Motion.Sensor.XXXXXXXXXXXX",
                "Disable.Motion.Sensor.XXXXXXXXXXXX",
                "Enable.Video.Stream.Only.Low",
                "Disable.Doorbell.Messages.FromDoorbell",
                "Enable.Motion.SmartDetect"
            ],
            "motionDuration": 10,
            "platform": "UniFi Protect"
```

**Screenshots:** Not applicable

**Environment:**

* **Homebridge Version:** v1.2.4
* **Node Version:** v12.18.3
* **Homebridge-UniFi-Protect Plugin Version:** 4.2.0
* **UniFi Protect Controller Version:** 1.16.9
* **UniFi Protect Controller Type:** UDM-Pro
* **Apple Device and iOS / macOS / iPadOS / tvOS Version:** iOS 14.2.1, macOS Big Sur, watchOS 7.2
* **Operating System and OS Version:** Docker on Synology NAS

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