When the dragon is killed, only 1 single end gateway spawns, instead of several gateways like in previous versions.
Tested in 3 different worlds created in 1.16 Pre 5. I used creative to replicate the issue. To replicate:
Create new world in 1.16 Pre 5 (Creative is faster to test)
Go to the end through the end portal in the overworld.
Destroy all end crystals and kill the dragon
Only 1 single end gateway portal spawns
Screenshots from all 3 tests are attached
Only 1 gateway is supposed to spawn when you kill it, every time you kill the dragon another one will spawn