Large dripstone structures can be generated outside the caves, it happens very occasionally, these are the examples of this error that I have found in this Dripstone Caves single biome world.
Seed: 6418872267320769497
Coordinates: /execute in minecraft:overworld run tp @s -1274.41 80.68 225.93 745.74 8.49
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I can confirm on a single biome Dripstone Caves world. It appears as if the dripstone does not stop generating at the top of the cave that it originates from.
Seed: 6418872267320769497
Coordinates: /execute in minecraft:overworld run tp @s -1274.41 80.68 225.93 745.74 8.49
Can confirm in 21w11a.
Can confirm in 21w13a.
Can confirm in 21w14a.

Can also be found in the newest 1.18 experimental snapshot
Please remember that the 1.18 experimental snapshots are not supported on the tracker. 🙂

Can confirm in 21w40a
[media]
relates to MCPE-139877 (bedrock)

Can confirm on 21w43a
Please attach the world generation settings you used to reproduce this.