Affects Version/s: Minecraft 18w19b
Fix Version/s: None
This bug is really hard to reproduce by the fact it is entirely random. Sometimes, weird platforms can appear around the same place. It occured to me 2 times on the same seed. One time with stone and the other time with half coral fans, half air.
Command to teleport: /execute in overworld run tp @s -231.64 67.37 -185.16 -584.10 39.00
Note that these platform got the size of the chunk that they are in.