JimmyReporter

@Niko

Still the generation has been somewhat changed between versions since even @violine1101 noticed that diamonds now generate at Y:16 when previously this wasn't the case.

Also you said that:

1.17 generates ores in smaller veins / I found singular diamond ores seemingly more often

Which is another argument for the perceived rarity of the ores, so far we basically agreed on the fact the diamond count is roughly the same with some statistical variation that seems still in the margin of what you could expect.

But what i'm saying is that we need more tests and to my understanding you also think that they could be useful since the main problem seems to be the Ore Distribution... you say that it's fine while imo it isn't, it wasn't specified in any of the patch notes that for 1.17 diamonds would generate in smaller veins or with singular ores or at Y:16 so we need to know now... is this an intended change?

And this change, which seems small could have an effect on how "lucky" you need to be to find these ores, they are more sparse now that's what i'm saying and less clustered which points to the fact that they may be more difficult to find even if their total amount is basically the same.

We need more data on their altitude and on how much clustered they are before reaching conclusions imo.

I attached an extract of Xisuma's video on Diamond Ores in 1.17 as an image to give an immediate example of his evidence, i hope he doesn't mind since it's for bug testing purposes. All credits go towards him of course.

On the left you can see 1.17 distribution on the right the previous distribution.

I recommend to watch his video that i linked in the comment above though in which he goes on a much more precise discussion about the issue.

Also, idk if it's possible but if he can reach the developers or viceversa it would be ideal i think.

@ampolive

I saw the result of the test you linked... (made by Grzegorz Graczyk (Noxitu)) yes the amount of diamond ores seems within the margin of normal statistical variation since it's only a -0,8% lower in the 1.17 version.

I noticed from the images however that the Diamond Ores altitude distribution is surely changed though, i think you should really upload those images.

They seem to confirm what @Johnny_9610 was talking about... maybe there's not (at least for everyone) a total amount of diamond ores reduction but the Y levels in which they generate seems much lower; these results would also partially confim the ones brought by Xisuma in his video. Xisuma's Diamond Ores Analysis

Y layers 8 ; 7 and 5 seems to be the most productive in terms of Ore allocation which is a deviation from the standard behaviour of 1.16.5.

Also, their distribution is much more varied on various levels with an amount that goes less than 2k (1750 median if i saw correctly) on 1.17 on each level this may contribute to their perceved rarity.

I think that THIS  might be the reason behind the rarity of them, not really the total amount (maybe) but their distribution.

We need further tests but i personally cannot recreate, at least without mods, the sample used by the mod above.

We should really investigate the Ore Distribution though, that seems the key.

TL;DR Even if not the total amount the distribution has clearly been modified.

I just want to add that the bug related to this one, so the MC-229191 has been confirmed as "Community Consensus" and it regards the same problems as this one.

So i think that either this bug should be confirmed too or it should be grouped with the primary issue which is as i said MC-229191.

@[Mojang] slicedlime

Thank you for your interest on this situation!
Sorry if there has been lack of reports on this issue previously, i know for certain though that a lot of people have experienced this bug.

I provided a lot of information as requested by the mods/staff and so did @ampolive and @Zedanity too.
If you need further tests or verifications just tell us so we can test it out.

@ampolive I guess you were right, i think that slicedlime thinks that we talking about the Bedrock Edition bug as seen from this reply of his on the Java 1.17.1 Pre-Release 1 thread on reddit:

You're talking about a Bedrock-specific bug. This post is about a Java Edition pre-release.

I would still maintain the bug report open until we have further verification/clarification from staff members/devs.

I can confirm the issue.
Diamond Ore and Deepslate Diamond Ore is significantly rarer on Y level 11 or 12 compared to the previous version.
The new best layers are Y:5 to Y:7

See the discussion on MC-229191

@ampolive
Yeah you're right, maybe i shouldn't write such an essay on this problem but some more explanation coming from the devs, helpers or modders would be appreciated by anyone i think, that was the point, i hope they can reply to our concerns.

I'm gonna be a little bit polemical right here but i just wanna say that i predicted that things would stay this way.

@[Helper] Anthony Cicinelli
This modification to Ore Generation was never announced as @ampolive said nor in a tweet neither in the patch notes.
To me it seems that we gotta cope with an unintended modification in Ore distribution because the fix is too difficult to implement and all of this while not warning the userbase of such a change.

There are multiple reports of this being an issue within the userbase with many complaints on various subreddits and discord servers since as i previously explained the lava lakes makes the process of acquiring diamonds extremely frustrating.

You're just dismissing the issue and the complaints with a very brief tweet without a further explanation, it seems a very bad way of communicating from the developers in this aspect.

I guess we just gotta cope with this issue until 1.18 is implemented even though i do not agree with this decision and i'm sure i'm not the only one.

Ok, i did another test too since i was noticing the scarcity of Diamonds in the latest release (1.17).

Using a completely random seed which is: 5424481921198933946, i generated two test worlds, one of them on the 1.16.5 version and the other on the 1.17.

I positioned myself at the initial coordinates

-58 15 21

and i repeatedly used the following command:

/fill ~-15 0 ~-15 ~15 ~ ~15 air replace #minecraft:diamond_ores

until i arrived at the coordinates:

-58 15 553

These are the following results:

1. I found a total of 258 Diamonds (Diamond Ore) in the 1.16.5 version;

2. I found a total of 229 Diamonds (Diamond Ore and Deepslate Diamond Ore) in the 1.17 version.

So i can confirm the issue.

P.S. I just wanted to add that this random seed wasn't the only one i tested and compared with the previous version and all of them had less Diamond Ores on the 1.17 version.
I also noticed and this might be important that on the 1.17 version the various Diamond Ores seem to spawn more frequently lower down in the world, next to Bedrock or very close to it and generally below lava lakes (which makes them extremely frustrating to find).
The Median Altitude of patches of diamond Ores in 1.17 seems to be 7,77... i also have some photos of me running around in Spectator Mode to highlight the issue... tell me if they are needed.