simple_vegetation places single blocks on ceilings weirdly

[careeoki]

Steps to Reproduce and Observed Behavior

Using the following, the block will be placed one block down from the actual ceiling. This doesn't happen for longer simple vegetations (ex. the glimmer worms in glimmergill caves)

		.{
			.id = "cubyz:simple_vegetation",
			.block = "cubyz:cave_sprouts:1",
			.generationMode = .ceiling,
			.chance = 0.5,
			.height = 0,
			.height_variation = 0,
		},