https://www.youtube.com/watch?v=O7nQP5VW3RM
This mod simulates diamond and ancient debris generation for a given seed and projects it into your world. Because of this it can bypass orbfuscator and so on. It will only fail if the server uses a different way to generate ores.
The mod is for 1.16. The 1.17 version is available as "oresim" in the Atomic client: https://github.com/cornos/Atomic
/diasim seed [worldseed](default: 0)
/diasim active [ON/OFF]
/diasim range [number](default: 100)
/diasim checkOpaque[ON/OFF](default: OFF)