Mineshafts can spawn in the deep dark, potentially distracting the upcoming warden

The Deep Dark can spawn mineshafts very deeply within it. These mineshafts could be prone to intercepting ancient cities once they're added, not to mention that spawners could ruin gameplay by distracting the upcoming warden.

To reproduce, use the seed -3945541560037994869 and run the following command:

/execute in minecraft:overworld run tp @p 2442 -47 5112