I thought he said his world was originally generated after update 1.16....... that IS the Nether update, therefore the netherite should have spawned.
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Any part of the nether generated before 1.16 would not contain netherite, gold, or have any biome other than what we now call the nether wastes (basically, that update contained all those features). In such a zone, none of the new mobs would generate (piglins, hoglins, striders), but you'd still get zombie pigmen which were replaced with piglins during the update. As said, you'd only get the new nether features by moving further, new areas would have to be generated as per the update, not the old generation.
That's pretty unlucky. I've mined for netherite since the update and I've gotten some reasonably easily (using the exploding beds method for quickness), like 3 ingots worth in three hours. If this is the case, you should delete this world and begin a new one. But, you're right to report this because worlds should not generate without such an essential resource.
If you're nowhere near a stronghold, the eyes of ender will not pick it up because they have limited range. If it can pick it up, it will float in the direction you need to travel. When you're getting very close to a stronghold, the eye will float above the location of the stronghold, and then go underground and add itself to the ender portal. You should at this point begin to dig down and you should arrive at or near the portal.
I've got the same problem since the 1.17 cliffs and caves part one update, although it sometimes wouldn't let me sign in after the Nether update (1.16) but it was intermittent. Now I am getting the error code crossbow which I have never seen before.
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I deleted all data yesterday and reinstalled Minecraft from scratch, so I know it isn't a corrupted save file or anything causing it. I'd like to be able to log in though.
This is definitely fixed. I've been mining today, and within an hour I found two blobs of 8 one of 5, and one of 3. In other words, more diamonds in one hour than I'd found in over ten hours of mining before this fix. With my fortune 3 pickaxe this translated to over 30 pieces of diamond! All I had to do was mine for long enough that new generation had to occur. I was mining at y=11. Thanks Mojang, I've now got my diamond armour and tools and have a reason to go looking for netherite again 🙂