"Platform group does not generate unique IDs" error when "YAML configuration reloading" groups

[backcountrymountains]

The problem

I reloaded my yaml configuration in developer tools and got the error:

2024-01-17 08:58:20.636 ERROR (MainThread) [homeassistant.components.light] Platform group does not generate unique IDs. ID livingroom_ceiling_wiz_lights already exists - ignoring light.livingroom_ceiling_wiz_lights

This is my yaml:

light:
  - platform: group
    name: "Livingroom Ceiling Wiz Lights"
    unique_id: livingroom_ceiling_wiz_lights
    entities:
      - light.livcw1
      - light.livcw2

I use packages to organize my yaml

I think this is very similar to #80188 and the bug with the command_line platform

Unrelated: If bedroom is one word, livingroom should be one word. Fight me.

System Information

version	core-2024.1.3
installation_type	Home Assistant OS
dev	false
hassio	true
docker	true
user	root
virtualenv	false
python_version	3.11.6
os_name	Linux
os_version	6.1.71-haos
arch	x86_64
timezone	America/Denver
config_dir	/config

Home Assistant Community Store

GitHub API | ok -- | -- GitHub Content | ok GitHub Web | ok GitHub API Calls Remaining | 5000 Installed Version | 1.33.0 Stage | running Available Repositories | 1384 Downloaded Repositories | 36

Home Assistant Supervisor

host_os | Home Assistant OS 11.4 -- | -- update_channel | stable supervisor_version | supervisor-2023.12.1 agent_version | 1.6.0 docker_version | 24.0.7 disk_total | 30.8 GB disk_used | 14.4 GB healthy | true supported | true board | ova supervisor_api | ok version_api | ok installed_addons | Samba share (12.2.0), Mosquitto broker (6.4.0), RPC Shutdown (2.4), File editor (5.7.0), Log Viewer (0.17.0), Advanced SSH & Web Terminal (17.0.3), Terminal & SSH (9.8.1), Duck DNS (1.15.0), ESPHome (2021.12.3), Z-Wave JS (0.4.3), SQLite Web (4.1.0), Custom deps deployment (1.3.4), MQTT Explorer (browser-1.0.1)

Dashboards

dashboards | 4 -- | -- resources | 25 views | 18 error | /config/notexist.yaml not found mode | yaml

Recorder

oldest_recorder_run | December 21, 2023 at 11:37 PM -- | -- current_recorder_run | January 16, 2024 at 10:00 PM estimated_db_size | 2056.58 MiB database_engine | sqlite database_version | 3.41.2

What version of Home Assistant Core has the issue?

core-2024.1.3

What was the last working version of Home Assistant Core?

core-2024.1.3

What type of installation are you running?

Home Assistant OS

Integration causing the issue

No response

Link to integration documentation on our website

No response

Diagnostics information

No response

Example YAML snippet

No response

Anything in the logs that might be useful for us?

No response

Additional information

No response

[joostlek]

This means you probably have this piece of YAML at more places

[backcountrymountains]

Yes, I was the problem all along. Oops.