Popup only shows full screen

[TrevskiUK]

My Home Assistant version: 2025.2.2
Companion app on Android 15, Pixel 8.

I am running an action browser_mod.popup in an Automation.

What I expected to happen:
A popup window is displayed containing my message.

What happened instead:
A full screen is displayed with my message. This happens no matter what the setting of "Size" is.

Minimal steps to reproduce:
Run the action (see below)

# The least amount of code or steps possible to reproduce my error

alias: Bed Heat away toggle popup
description: ""
triggers:
  - trigger: state
    entity_id:
      - input_boolean.bed_heat_away_toggle
conditions: []
actions:
  - action: browser_mod.popup
    metadata: {}
    data:
      dismissable: true
      autoclose: true
      browser_id:
        - ccf5712711c219d3b2565912f02e20e3
      content: >-
        Home/Away mode is now  {% set t =
        states('input_boolean.bed_heat_away_toggle') %} {% if t == 'on' %}
        Active.  {% else %} Deactivated. {% endif %} 
mode: single

Error messages from the browser console:
None

// Select everything from the browser console and copy it

// Paste it here

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