How do you reload the (google) calendar integration?

Previously I had a script that ran the following to reset the calendar prompting an immediate sync with Google.

alias: Reload Calendars
sequence:
  - service: homeassistant.reload_config_entry
    data: {}
    target:
      entity_id: calendar.schedule
mode: single
icon: mdi:calendar-today

It was working fine for months, but now the calendar integration is fixed again I decided to reinstate my google_calendar.yaml so I can move all my schedule entries back into a single calendar with HA showing each type of event split into each’s own entity/calendar.

Since reinstating the file, I now get an error pop-up when running the command either from the script or directly in Developer Tools | Services.

image

If I go to Settings | Devices and manually reload the Google Calendar integration there it works fine.

Is it maybe a bug?
It was working fine up until I put that file back in place

Raised as a bug in core.