The bug MC-214844 reported as fixed still happens very rarely and less aggressively at the deepest layers of the world.
Seed: -9113941034942409366
Mineshaft coordinates: -159 -63 409
Grimstone Cavern: -472 -56 420
Linked issues
duplicates 1
Attachments
Comments 4
I just put the info for this bug report on MC-214844. It will likely have to be reopened. But it is also entirely possible that this is intentional.
Can you please provide the seed and the coordinates?