This used to be an issue about a year ago. But I am seeing more reports on it now, just as you have noticed.
In the past, a workaround was to delete a folder in the Official folder - one item - something small in size (but the entire folder) so that when MSFS checks for any missing items, it will queue a download check of default content and then automatically download it.
This is one topic I found on it:
https://forums.flightsimulator.com/t/fixed-on-live-1-19-8-0-you-are-missing-packages-that-are-essential-to-run-microsoft-flight-simulator-please-update-the-application-and-try-again/427269/55
Now, I’m not sure if this would still work as a workaround, but worth a try.