dripstone generates on the outside of mountains

I found a dripstone on the side of a mountain, there is a cave that was cut of by the side of the mountain and the dripstone generated in a dripstone biome that cut trough the side of the mountain. seed: 48167583078731287 location: /execute in minecraft:overworld run tp @s 292.30 90.00 395.10 898.08 15.30