[Minecraft] Is the terrain generation in the Nether strange? Causes and countermeasures for terrain collapse, cavities, and lava-covered areas

In recent Minecraft,

• When you go to the Nether, the terrain is cut off in the middle
• Biomes floating in the air
• A portal is generated inside the wall
• Spawn buried in lava

An increasing number of players are suffering from Nether terrain generation abnormalities (crashes/generation errors).

In this article, we will explain
Why terrain trouble occurs in the Nether,
Is it a bug or a specification, and
Safe measures that can be taken right now .

---

What is the terrain generation problem in the Nether?

In the Nether, when chunks (terrain division units) are generated,

• Terrain generation
• Biome placement
• Structure (fortress, fort, etc.) placement

will be processed at the same time.

If this process fails or conflicts ,
the following errors will occur.

---

Common Nether terrain generation symptoms

① Terrain is interrupted in the middle/cross section is visible

Symptoms

• The wall appears to have been cut off vertically
• As you move forward, it suddenly becomes hollow

Reasons

• Chunk generation stopped midway
• Temporary failure when saving the world
• Entered the Nether for the first time under high processing load

---

② Nether fortress/fort is buried in the terrain

Symptoms

• Fortress passage buried in bedrock or netherrack
• Unable to reach treasure chest or spawner

Reasons

• Synchronization difference between structure generation and terrain generation
• More likely to occur after updating the version in an existing world

---

③ A portal directly connected to the lava sea is generated

Symptoms

• The moment you enter the Nether, lava flows in.
• The portal is floating in the air

Reasons

• Nether side safety check did not work properly
• Portal was generated while surrounding chunks were not generated

---

④ Biome floating in the air

Symptoms

• The Basalt Delta and distorted forests float in the air
• Completely hollow at the bottom

Reasons

• Terrain generation fails after biome generation
• Typical example of chunk corruption

---

Why does this problem tend to occur recently?

● Existing world after major update

Nether generation strongly depends on the settings and internal data when creating the world.
Therefore,

• World created with old version
• A world spanning major updates

New production rules and old chunks are more likely to collide .

---

● Processing load・Insufficient module

Failure rates are particularly high in the following situations:

• There is a lag when entering the Nether for the first time
• Massive movement of other players at the same time (multiplayer)
• Introduced many MODs/Datapacks

---

● Instability specific to Bedrock version

In the integrated version,

• Chunk generation is likely to be delayed
• Save timing is critical

There is a characteristic that
Nether generation troubles tend to be easily visualized.

---

Safe measures you can take now

✔ Be sure to take a backup before entering the Nether for the first time

• Required even for singles
• Server checks automatic backup settings

---

✔ Do not enter the Nether with lag

• Temporarily lower the draw distance
• Stop other heavy processing (device operation)

---

✔ Leave the problem chunk and reload it

• Go back a few chunks
• Log in again

This may fix minor generation errors.

---

✔ In serious cases, move to “unexplored direction”

• Chunks that are already corrupted will not be repaired
• It is often generated normally in ungenerated areas

---

Things you shouldn’t do

❌ Forcibly digging through the terrain
❌ Forcibly destroying structures
❌ Quitting the game while saving

These are the causes of world corruption.

---

How to tell if it’s a bug or a feature

Situation	Judgment
It is broken in the same way every time	It is closer to the specifications
It can be fixed by reloading.	Temporary error
Does not occur in another world	World dependent
Corrupts only in a specific direction	Chunk corruption

---

Summary: “Advanced measures” are the most important when dealing with Nether terrain troubles

• Nether generation is a very heavy process
• Once a chunk is broken, it basically cannot be recovered
• Backup + weight reduction at first entry is the greatest defense

In order to use the Nether safely,
“preparation before entering” is most important.