I can't update this report since I didn't create this ticket. However, I can post what I posted on the ticket that was prematurely closed.
Editing this as @unknown seems to have it down in the comment above. Thanks!
@unknown I already created a bug for this in the format you specified. It was marked as a duplicate, as you can clearly see.
@everyone else: I have been playing on the 1.17.10.23 beta with the caves and cliffs switch enabled. Perhaps this is why I am unable to see any dungeons. For now, using cave spider spawners to create xp farms as they seem to be unaffected in mineshafts.
Chunkbase shows where the dungeons should be; however, they are not there when you actually load in, and go to the coordinates.
Did you actually load in the game and teleport to those dungeon locations 8 out of the 10 times in 1.16/1.17 or did you just look at the output from Chunkbase? In 1.17, when I visit the locations Chunkbase lists, there is no dungeon, 100% of the time.
Also, although there is no command to search for dungeons, there is a website to search for these structures. Before 1.17, you could use the app to instantly find the dungeons. Now with 1.17, using the same app, the locations where it marks the dungeons do not appear when you play the game. Not a feature request, definitely 100% a bug. I'm not requesting a new feature, I'm simply requesting that they return dungeons back to the game.
Any seed is viable to reproduce the bug, just play the game. You won't find any dungeons if you play on 1.17 or later.
By "Dungeons" he means these dungeons. I have been having the same issue - can't create any XP mob spawner farms to remend my gear if I can't find any dungeons.
@unknown Gotcha, thanks!