Calendar widget missing some calendars

I have a bunch of calendars in my Google calendar, and the calendar widget in Niagara used to show all of them, but now I have 3 that it won’t show no matter what I do.

I have completely uninstalled and re-installed Niagara to no avail.

I have marked them un-synced in the calendar app, then re-marked them and that didn’t help.

The calendars do have one thing in common… they are all calendars added by url and synced by Google. All of my other calendars are google shares (i.e. someone else in Google sharing their calendar with me). But like, I said, they used to show up in Niagara, but no longer.

I would be happy to try anything that would help with debugging this.