core: Integration 'm' not found

The problem

I started getting this error after updating to 2023.10.3 from 2023.9: when I refresh config.yaml, I get a “Integration ‘m’ not found” error. This will also show in the logs

What version of Home Assistant Core has the issue?

core-2023.10.3

What was the last working version of Home Assistant Core?

core-2023.09.02

What type of installation are you running?

Home Assistant Supervised

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?

Logger: homeassistant.components.websocket_api.http.connection
Source: components/websocket_api/commands.py:226
Integration: Home Assistant WebSocket API (documentation, issues)
First occurred: 17 de outubro de 2023 às 22:26:16 (2 occurrences)
Last logged: 12:02:42

[547532023872] Integration 'm' not found.
[547710465472] Integration 'c' not found.
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/components/websocket_api/commands.py", line 226, in handle_call_service
    await hass.services.async_call(
  File "/usr/src/homeassistant/homeassistant/core.py", line 2012, in async_call
    response_data = await coro
                    ^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/core.py", line 2049, in _execute_service
    return await target(service_call)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/helpers/service.py", line 986, in admin_handler
    await result
  File "/usr/src/homeassistant/homeassistant/components/homeassistant/__init__.py", line 352, in async_handle_reload_all
    await asyncio.gather(*tasks)
  File "/usr/src/homeassistant/homeassistant/core.py", line 2012, in async_call
    response_data = await coro
                    ^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/core.py", line 2049, in _execute_service
    return await target(service_call)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/helpers/service.py", line 986, in admin_handler
    await result
  File "/usr/src/homeassistant/homeassistant/helpers/reload.py", line 176, in _reload_config
    await async_reload_integration_platforms(hass, domain, platforms)
  File "/usr/src/homeassistant/homeassistant/helpers/reload.py", line 53, in async_reload_integration_platforms
    await asyncio.gather(*tasks)
  File "/usr/src/homeassistant/homeassistant/helpers/reload.py", line 63, in _resetup_platform
    integration = await async_get_integration(hass, integration_platform)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/loader.py", line 900, in async_get_integration
    raise int_or_exc
homeassistant.loader.IntegrationNotFound: Integration 'm' not found.

Additional information

No response