I can't find any dungeons on any world generated on the 1.17 version.
More information from EVGENSYPERPRO
Dungeons are not generated when the "caves and cliffs" switch is on
Steps to Reproduce:
Create a new world with the experimental "caves and cliffs" feature
Try to find a dungeon
You won't be able to find any dungeons.
Dungeons will be generated.
You can also use this website when searching for dungeons.
However, remember that the site may contain errors...