What I expected to happen was...:
My new world to generate using all 1.19 rules
What actually happened was...:
My new world generated several chunks directly around spawn using 1.17 algorithm for surface biomes, but all underground biomes and biomes past approx -300 are generating as 1.18/1.19 algorithm biomes. (I'm assuming 1.19, but 1.18 & 1.19 look pretty similar in the general vicinity.)
Steps to Reproduce:
1. All I did was start a new world on our existing Java Realm using seed # 606045115702081861, survival mode, easy difficulty. 🤷♀️ I can't really re-do it or my kids would mutiny because we've already done a ton of work on our starter base.
2. When I created a single player world using the same seed and settings it worked right.
(Edited to clarify- 1.17 vs 1.19 algorithms, so the bug is in WHERE the biomes appear, not just WHICH biomes appear.)
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Oh... 1.19 only added two new biomes the Mangrove Swamp and Deep Dark. All the previous biomes still exist and had no change in 1.19 so there isn't any issue here.
No, there's still a problem. Look at the pictures. Spawn was supposed to be on a beach with ocean on one side, plains on the other, and a really cool mountain behind the village. Instead several chunks of river and mountain biome got pasted in and ruined the view and layout of the village. While that might not be that big of a thing, just aesthetic, the question remains: how and why did my realm use 1.17 terrain algorithms at all, when it is a native 1.19 realm? It shouldn't have been able to, it wasn't supposed to, therefore it's a bug.
Moved to REALMS project since it's likely a server-side issue.
If you venture away from spawn, does the new terrain there match the 1.19 algorithm? So, is it just the area around spawn or the entire world?
Also did you enable any data packs on your realm? That might mess with worldgen too.
Edit: Also, what steps did you take to generate the new world? Did you use a template or something similar?
Oops, I thought I put it in Realms to begin with.
Yes, once we get past a certain distance from spawn I think it's right. We haven't explored too very far yet.
There are no data packs or templates or anything. Just vanilla realm with a specific seed number.
I'm planning on getting on there today and actually doing some exploring to see just how far the glitch goes. We've been mining and trying to get everyone geared up first.
Okay. So I went back into the realm and completed 4 adjacent maps, zoomed out twice. (Because that's what we started with, because kids LOL) (labeled Realm)
Then I created 3 different creative worlds.
Created in 1.17.1, stayed in 1.17.1, completed the same 4 maps. (labeled 1.17)
Created in 1.17.1, spawned in, flew straight up to look around, then exited without leaving world spawn. I then opened it in 1.19 and completed the same 4 maps. (labeled Exp.)
Created in 1.19, stayed in 1.19, completed the same 4 maps. (labeled 1.19)
Now, I'm not sure what the default render distance is on a realm... or if I have changed ours at some point... But the realm & the experiment look... similar. I'm guessing my singleplayer render distance is higher.
What I can't figure out is how/why the brand new world created on our realm just for 1.19 used 1.17 algorithms at world gen and then switched over before we explored anything.
Were the chunks past -300 already explored in 1.17 or is 1.19 the fist time you explored that far? The underground biomes are a result of world upgrade between 1.17 and 1.18+ versions and is intended.