Firstly I'd like to state that I already sent a bug to the author of this issue while using his datapack but he told me to submit a bug to Mojang because it has something to due with Minecraft and a bug

Load up the datapack and go into the ocean in a boat or swim and swim/drive around for awhile until the game crashes.

I believe its due to his custom ores made from player heads and when the player heads try to get loaded in water via the datapack it crashes the game. Either way this should be addressed because it may do this with other blocks that are generated via a datapack thus making some datapacks pointless

Description: Rendering Block Entity

java.lang.IllegalArgumentException: Cannot get property bpm{name=rotation, clazz=class java.lang.Integer, values=[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]} as it does not exist in Block{minecraft:water}
	at boe.c(SourceFile:95)
	at cyr.a(SourceFile:61)
	at cyr.a(SourceFile:26)
	at cyi.a(SourceFile:148)
	at cyi.a(SourceFile:128)
	at cwh.a(SourceFile:694)
	at cwb.b(SourceFile:984)
	at cwb.a(SourceFile:893)
	at cwb.a(SourceFile:753)
	at ciq.c(SourceFile:814)
	at ciq.a(SourceFile:379)
	at net.minecraft.client.main.Main.main(SourceFile:144)