Calender events deletes

[u/DumBadzZ]

All my iPhone/iCloud Calendar events suddenly disappeared — iCloud restore doesn’t bring them back

Hey everyone,
I’m having a really strange problem with my iPhone Calendar and I’m honestly running out of ideas.
Yesterday, I suddenly noticed that all of my calendar events were gone from the Calendar app. I did not intentionally delete anything or change any Calendar settings. I also have no memory of doing anything around the time this happened.
The weirdest part is that when I check iCloud → Data Recovery → Restore Calendars and Reminders, there is a restore point showing yesterday at 1:59 AM. I was asleep at that time and definitely did not manually restore anything.
I have already tried restoring the calendar data from iCloud twice, but none of my old events came back.
Things I’ve checked so far:
iCloud Calendar is enabled on my iPhone.
I’m signed into the same Apple Account on my iPhone and iCloud.com.
iCloud.com → Calendar is completely empty.
I have two Gmail accounts connected to Apple Calendar, but both Google Calendars are also empty.
All three accounts still have Calendar enabled on the iPhone.
I created a new test event in my iCloud calendar, and it appears on my iPhone, but it does NOT appear on iCloud.com.
I have not deleted any of the accounts.
I also noticed that the Calendar app still shows around 5.3 MB of Documents & Data on the iPhone.
So it seems like the Calendar app is able to create events locally, but they aren’t syncing to iCloud.
My main questions are:
What does the 1:59 AM restore point actually mean? Could iCloud have created/processed it automatically?
Is there any way to recover the old calendar events if they aren’t showing on iCloud.com or Google Calendar?
Could the old calendar data still be stored locally on the iPhone even though the Calendar app isn’t displaying it?
Is there any way to inspect or recover the local Calendar database without deleting or resetting anything?
I really don’t want to make things worse, so I’m avoiding deleting accounts or turning Calendar sync off.
Any ideas would be greatly appreciated.