My calendar (both the widget on the dashboard and the full page) are not showing synced activities on the week view nor the month view. However, the Weekly Totals column on the full page month view reflects the totals from the synced activities that aren't showing up, so they're definitely not just completely missing. The activities widget on the dashboard also shows my most recent activity, so like I said, the activities are definitely synced and in the system. They're just missing from the week and month views. Attached is a screenshot of this week from the full page month view: you can see that there are no activities on any days, yet the totals don't equal zero (and, in fact, are the correct totals for this week's activities).
How do I fix this? I seem to be in the minority, but I actually really like the Modern version of GC and would prefer to keep using it if possible. The missing activities is very problematic, though.