The bug

If a block with no facing state (like quartz bricks) is added to #wall_corals block tag the game will crash when attempting to generate a coral reef.

(1.16.5) crash-2021-05-06_00.27.53-server.txt

Description: Feature placement

java.lang.IllegalArgumentException: Cannot set property cfb{name=facing, clazz=class gc, values=[north, south, west, east]} as it does not exist in Block{minecraft:quartz_bricks}
	at cej.a(SourceFile:114)
	at ciy.b(SourceFile:51)
	at ciz.a(SourceFile:58)
	at ciy.a(SourceFile:27)
	at ciy.a(SourceFile:19)
	at civ.a(SourceFile:55)
	at cku.a(SourceFile:20)
	at cku.a(SourceFile:11)
	at civ.a(SourceFile:55)
	at cjb.a(SourceFile:23)
...

Reproduction steps

1. Add the attached datapack MC-224778.zip to a new world.
2. Wait for the world to generate.
   1. If the game instantly crashes, that means that a warm ocean was right by the spawn point.
   2. If not, locate the biome and teleport to the coordinates it gives you.

      /locatebiome minecraft:warm_ocean
      

      The game crashes