Repeated Mobile Notifications on single state change - why?

Mobile Apps Home Assistant Companion for Apple
1

I have a binary sensor automation to send me a mobile notification when it transitions from off to on. The problem is that HA will send me a notification roughly every minute when the sensor state is on. I just want a single notification until it changes from off to on again. Is the repeated notification expected behavior? The binary sensor if from an ESP device, and I can see in the ESP log that the transition is not bouncing, so repeated notifications are not coming from that.

Here is the automation yaml:

alias: Trap Activation
description: ''
trigger:
  - entity_id: binary_sensor.trap
    platform: state
    from: 'off'
    to: 'on'
condition: []
action:
  - device_id: ce030dd6c600481bb03ffcbaebb68014
    domain: mobile_app
    type: notify
    message: On!
    title: On!
    data:
      push:
        badge: 1
mode: single