I'm looking at my March 2020 dates and it shows that the park opens at 10:00 am. The Extra Magic Time is listed at 8:30-9:30 am. What happens during the gap of when the Extra Magic Time is over (9:30) and when the park opens (10:00)?
Don't worry, nobody knows why this as it is. If you have access to the hours, you can just keep using it, and the hours are actually from 8:30 - 10:00.