[MC-241630] Temperatures don't properly get converted

The Bug:

Temperatures don't properly get converted when upgrading to 1.18. This can cause snow golem to die.

Steps to Reproduce:

Create a world in 1.17.1 with the seed: 3289848721474072111
Do /tp @s -17 ~ 563
Leave and open the world in 1.18 pre-release 1
Summon a snow golem at your position

Observed Behaviour:

The temperature changed and the golem died

Expected Behaviour:
The temperature wouldn't change

Linked issues

relates to 1

MC-272081 Snow golems can now create snow trails in any biome Open

Comments 3

Justin Barker 2021-11-16T00:41:25Z

I wasn't able to reproduce this, but I found a related issue (MC-241636) where snow golems don't die, when they actually should. Could you provide a seed and coordinates of this issue occurring?

Rosie Baish 2021-11-16T09:24:45Z

I've looked again, and in a plains at 0.200 it survives, but in a Savannah at that temperature it dies
Which I think is as intended?

But within my shulker farm I have a temp of 0.209 in a plains and they're dieing.
So is the bug here that you shouldn't be able to get a temperature >0.200 in a plains

That world has seed 3289848721474072111 and was created in 1.16 before upgrading to 1.17 (or possibly 1.17.1) and then to 1.18pre1
location of the farm is -17, 563

Creating a new world with that seed in 1.18-pre1 makes that location a savannah so are upgraded worlds using post 1.18 temperature maps with pre-1.18 biomes?

anthony cicinelli 2021-11-16T14:36:40Z

I was able to confirm. The issue here seems that the temperature doesn't properly get converted when upgrading. I've updated the report to reflect this.