Here is another world, with seed shown in picture. There is no End City this time, but the dragon and home portal are still gone. The second picture shows the coordinates of nearest EndCity, have not visited it.
I suspect this is a temporary removal of the dragon bossfight and its biome features to allow for quick and safe access to the outer islands for the devs, and it will be fixed in Release 1.14.0.
But since the centre island's features are changed, there is a rare chance for End Cities to spawn on the centre island during these snapshots, and apparently they float, because normally end cities spawn on end highlands, not the generic 'End' subbiome with lower altitudes throughout its terrain.