🐛 Properly register new device states to the dictionary in PowerService.

Exo.Service.Core/PowerService.cs

@@ -377,6 +377,7 @@ private async ValueTask HandleArrivalAsync(DeviceWatchNotification notification,
 		if (!_deviceStates.TryGetValue(notification.DeviceInformation.Id, out var deviceState))
 		{
 			deviceState = new(this, _devicesConfigurationContainer.GetContainer(notification.DeviceInformation.Id), notification.DeviceInformation.Id, default);
+			_deviceStates.TryAdd(notification.DeviceInformation.Id, deviceState);
 			shouldPersistInformation = true;
 		}