Events from multiple Google calendars not appearing in calendar widget

On a Motorola Razor 2025 running Android 16.

I have four Google/Gmail accounts set up on my phone with various sub-calendars, both natively created as well as subscribed.

Everything works as expected in the Google Calendar app, however only one native calendar (the primary calendar of one Google account) as well as one subscribed calendar (from the same Google account) are displaying events in the calendar widget. All calendars are visible and selected in the Niagara calendar settings filter, but only events from the two calendars are showing up.

I’ve cleared cache and storage, restarted the app, and uninstalled/reinstalled, but nothing has fixed the issue.