Sulfur caves generating on the surface of mushroom islands

On mushroom islands, if the weirdness noise value reaches below -1.4 (approximately), sulfur caves will generate on the surface forming a big grass patch that spawns sulfur cubes on it & spawns hostile mobs at night. It doesnt spawn any common mobs like sheep or pigs though.

Due to such low weirdness being extremely rare, i have provided some seeds (with coords) for proof.

-4390562135530562493 /tp @p 80 ~ 61 (seed in screenshots)

-4390562135515552438 /tp @p -270 ~ -16

-4390562135513108426 /tp @p 500 ~ 273

Ive tested with 1.4 weirdness as well but its normal (idk what i expected)

EDIT: On bedrock it generates stone instead