This night my friends and I wanted to fight the ender dragon. So we geared up and come all to the portal. When we did go through, there wasn't a platform. Some felt to there death. Others left and I set everyones gamemode to spectator.

So. I tested later on a vanilla 1.14 server with a set seed. There was a normal end platform.

Then I also loaded up a new spigot server with the same seed(fresh generator in spigot) and did also go to the end. To find not a platform. This seed wouldn't have killed the players.