Dungeon cracking and Fungus cracking doesnt work anymore sadly.
SeedcrackerX itself is not dead though!
Before cracking go to the config menu via "/seed gui" and make sure that Emeralds, Gateways, Biomes, Desert wells and Warped fungi are disabled since they arent updated and can give wrong data.
For cracking you now need to find 5 structures from the listed ones:
Desert pyramids, Jungle temples, Witch huts, Shipwrecks, Igloos, Pillager Outposts
Any combination is valid. For example: 3 shipwrecks, 1 pyramid and an igloo.
You can track you process with "/seed data bits" (look at the bits count for liftable structures)
A structure is found when there is an outline around it.
After you got enough the cracking process starts automatically. It takes 1-10 mins
The mod may ask you to find additional structures after this.
Its more likely to happen with less bits and structures of the same type.
After reducing your structure seeds the mod will brute force your world seed via dungeon positions or hashed seed.
additional info:
No, the hashed world seed seed that the mod gives you while entering a world is not the world seed.
This version is not tested on older generation (It probably still works though).
I recommend to find shipwrecks with a boat. the cracking process probably needs additional structures but you've most likely also found some monuments while boating.
There are no additional mods required
To restore the structure data from your last time in a world you can use "/seed data restore"
Cracking the seed with structures and end pillars is also still viable
Feel free to join my discord for additional help https://discord.gg/m48YVmaQfY