[MC-129767] Dungeons not generating at same positions anymore

WAI reason

I've chatted with Prof, it's an unfortunate change due to the updating of the world gen code that's considered "Working as intended". Sorry!

– rockenroll4life (Josh Letellier) in this Reddit comment

The bug

Dungeons are not generating anymore at the positions where they used to generate in previous versions with the same seed.
In general it looks like less dungeons are generating.

Examples

Older version	Newer version

Seed	Position	Version dungeon existed	Version dungeon was missing
7015474738862924540	/execute in overworld run tp @s 424.78 41.00 -466.80 -176.19 24.85	18w09a	18w10d

The bug

Dungeons are not generating anymore at the positions where they used to generate in previous versions with the same seed.
In general it looks like less dungeons are generating.

Examples

Older version	Newer version

Seed	Position	Version dungeon existed	Version dungeon was missing
7015474738862924540	/execute in overworld run tp @s 424.78 41.00 -466.80 -176.19 24.85	18w09a	18w10d