I had this happen and there seems like no solutions out there. Until I did the following, I opened the calendar on my Samsung S9+ and went to a day, In my case Friday May 29. I get paid every 2 weeks and like to have a reminder, so I hit the + to add event, gave it a Title from my already used Title, made sure my location was at My Calendars, under Repeat I Customized for 2 weeks and under Duration I put Forever. Then I saved it. After that my phone said this overlaps with another event. I scrolled to the next month and Holy $hit there is my whole missing calendar going through the few years. I deleted my duplicate event and Synced my phone. It's all there. I hope this helps.
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