I received an email from Disney about this. They’re cancelling all the reservations for dining and experiences because of the move to the reservations for park entry. It also said that modifications have been suspended while they update to the new system.
“To manage attendance and foster physical distancing during this unprecedented time, we’ve changed—and even suspended—some dining and other experiences. In addition, we will also be introducing a new Theme Park reservation system.
Unfortunately, these new measures have required us to cancel any dining reservations and experience reservations you may have made.We recognize the inconvenience this poses and we’re deeply sorry. There’s nothing you need to do at this time. We’ll be contacting you with details on this new system soon.”