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Underground lava and water lakes and mob spawners generate with air instead of Cave air (cave_air)

The nether generates overworld features

lava is very dark

Lava Texture

Striders float in the air when hit by a knockback enchanted bow

Floating cactus on a lava lake

Floating snow

Lava lakes spawn more on the surface than usual

Other stones than the regular stone can spawn near lava lakes in surface in superflat world

Lava can generate in ancient cities and make structures fly

Lava lakes generate in icebergs