Why is water diggable?

[BF5258]

In versions 1.19 and 1.20 water and lava are marked as diggable. This cause mineflayer-collect block to try to mine them.

My understanding is that "diggable" means able to be broken in survival by mining. If this is not the case, please explain.

[rom1504]

yes we need to agree on the definition and fix it, can you look into it?

[BF5258]

minecraft-data-generator considers any non-air block with finite hardness to be diggable. (BlocksDataGenerator.java)

Water and lava both have a finite hardness but cannot be targeted. (minecraft.wiki)

Checking for water and lava as well as air should fix it, but I am unfamiliar with Java.