Google Calendar Sensors have gone unavailable

Configuration
1

So I have the trash pickup schedule based on a google calendar. It was working fine for the last 2 years but I’ve recently updated my hardware and I’ve found that the sensors I had created do not work anymore. The calendar tab on the side does show the calendar so this post has been a dead end. I’ve also looked into the solution for this post and it hasn’t helped.

Here’s an example of one of these sensors:

 general_trash:
      friendly_name: 'General Trash'
      icon_template: mdi:trash-can
      value_template: >
        {% set start_time = states.calendar.rest_waste.attributes.start_time %}
        {% set pickupday = strptime(states.calendar.rest_waste.attributes.start_time, "%Y-%m-%d %H:%M:%S").strftime("%A") %}
        {% if as_timestamp(start_time) > (as_timestamp(now()) + 86400) %}
          {{ ((as_timestamp(start_time) - as_timestamp(now())) / 86400) | float | round(0, 'ceil') }} days
        {% elif as_timestamp(start_time) > as_timestamp(now())  %}
          Tomorrow
        {% elif (as_timestamp(start_time) - as_timestamp(now())) > -86400 %}
          Today
        {% else %}
          Unknown
        {% endif %}

I cannot remember if the state attributes for rest_waste had a start_time, but when I check the dev tools, I only see offset_reached and friendly_name. There should be more available according to the Documentation, though.

Has anyone had a similar issue or can help me troubleshoot this?