I did the Blue Bayou Fantasmic dining package on 11/29/19 for lunch. Luckily, I read (prior to the trip) from disboards postings that they weren't giving out (or ran out of) the seat cushions, so we brought our own cushions from a prior trip years back (they're also Fanstasmic seat cushions).
To put it short, when the server presented us with our Fantasmic tickets and light-up lanyards, I asked the server what had happened to the seat cushions. He said that someone had made a mistake in the ordering of the seat cushions, so Disney is currently giving light-up lanyards to compensate until the seat cushions come back (according to him, of course). So, thanks to disboards, we had brought our own cushions stored in the rental locker and weren't put-out by it when we watched Fantasmic that night.
Long version: On 11/29, my family arrived 20 minutes earlier than our 12:30pm reservation and requested a waterside table (we were fine with waiting). The castmember said she'd check on the wait time. She came back promptly and let us know it might be a 20-30 minute wait. So we waited. To our surprise, it was only about 5-10 minutes before they called our group to be seated. We got a lovely water-side table along the edge. We were greeted by a server with bread, and soon presented with our Fantasmic-package menus. We waited a little bit after ordering. Food was great and so was dessert. When the server presented us with our Fantasmic tickets and light-up lanyards, I asked him what had happened to the seat cushions. He said that someone had made a mistake in the ordering of the seat cushions, so Disney is currently giving light-up lanyards to compensate until the seat cushions come back (according to him, of course). So, thanks to disboards, we had brought our own cushions stored in the rental locker and weren't put-out by it when we watched Fantasmic that night.
We had a great time a both the restaurant and at Fantasmic that night! It had rained our first day all day on Thanksgiving (Thursday), and we had our Blue Bayou Fantasmic-package lunch on Friday. Luckily, there wasn't any rain Friday night (short of a brief drizzle) and Fantasmic wasn't cancelled nor were the fireworks after, so we enjoyed the Fantasmic show in the reserved area (with plenty of room to sit) and then stood up after the show to enjoy the fireworks and the water-screens in the river before us. Magical night
The following night (Saturday) it rained and the fireworks were cancelled, so our Friday night worked out perfectly.
Hope I helped!