[MC-120594] World generation spawns too many monsters at the same place

The bug

It looks like the world generation can spawn too many monsters at the same place.

Note: MC-4061 is marked as related since @unknown had one chunk error while trying to reproduce this bug, however that time no monsters spawned.

How to reproduce

Outdated, though this issue might still occur

Ensure your render distance is set to at least 9
Create a default world with the following seed
```
8627439086671208170
```
Teleport near the position
```
/tp 920 70 -1736
```
Wait some time, maybe about 10 seconds
Switch to Spectator mode
```
/gamemode spectator
```
Teleport to the exact position
```
/tp 908 27 -1774 180 50
```

Related issues

relates to

MC-4061 Entity Mass Spawning near chunk error

MC-91055 More than 1 mob spawning in a 1 block space

Attachments

Too many monsters at same place (1.12.1).png

Comments

migrated 2017-09-09T20:57:08Z

[media]

migrated 2020-03-20T07:35:23Z

Can't confirm in 1.15.2. There was a cave at that place. Seems like world gen has changed a bit

Avoma 2021-08-18T14:36:47Z

I am also unable to reproduce this issue in 1.17.1.

marcono1234 2021-08-18T20:17:18Z

Resolving as Cannot Reproduce then.
I had in the past only noticed the issue for that specific cave (but in a reproducible way). With world generation and mob spawning changes in recent versions it is likely that this was either fixed or a new location has to be discovered where this occurs.