Here is my timeline so you know how Disney handled our reservation. Our dates were May 10-18. They sent me the email last Tues 4/21 letting me know that our dates were impacted from the 10-16th and i could cancel, reschedule etc.
Then I noticed on Wednesday morning two of my three after hours parties had dropped off
MDE and on Thursday the last after hours party dropped off and Disney on that day also cleared all the park hours from their calendar for the 10-16th. At that point my date based tickets still showed as expiring in May.
My refund of two of my parties showed up in my cc acct on Fri and the 3rd party showed as a pending credit by Saturday morning. Then also on Saturday, my date based park hopper tickets automatically changed now being valid from 5/10/20 thru 12/15/20. At that point I hadnt even officially cancelled my reservation with Disney but they had already changed the dates. I went ahead and officially cancelled with them today.
We are rescheduled for Sept. but may not go if everything isn't open we enjoy, but since my tickets are active until 12/15, I can change the dates on my tickets to next May this fall and pay any small difference.