Here is an screenshot from the nether, you can see ancient debris!
Another screenshot that this time proves that the water is visible.
Here is an amethyst geode and some lava and gravel.
A screenshot that proves that the lava is visible.
Another screenshot from overworld.
So, you probably know other textures for x-ray, but this is different, you can see the grass and dirt, gravel (so you can see where the gravel is to keep it from falling on your head). Lava is visible, so in nether you will see where is the lava and, you will see all ores. Blocks that are invisible are netherrack, stone, tuff, deepslate, andresite, granite, soul sand, soul soil, blackstone etc. You can find geodes with amethysts because they aren't invisible. And, if you turn on vibrant visuals, you will see an glowing effect to ores. So... Have fun, and don't use them in public servers, you can be banned if you use x-ray on public servers!
REMEMBER: TO BE ABLE TO SEE ORES, GET AN NIGHT VISION PACK OR SOMEONE POTION AND TURN OFF SMOOTH LIGHTING AND BEAUTIFUL SKIES, I TESTED THE PACK ON LATEST VERSION (1.21.132) WITH THESE SETTINGS OFF AND IT WORKED. 
Hi! If you want some help at the start of a new world, you NEED to look here.
Hi! If you want some help at the start of a new world, you NEED to look here.
