The Bug
For some reason, when I set the random tick speed, fire behaves like nothing changed.
Steps to Reproduce
Summon a large number of leaves and ensure that the "randomTickSpeed" gamerule is set to its default value, (3).
/fill ~3 ~ ~3 ~10 ~4 ~10 minecraft:oak_leaves[persistent=true] /gamerule randomTickSpeed 3
Ignite the leaves, wait around thirty seconds, and take note of how fast the fire spread.
Once again, summon a large number of leaves, but this time, change the "randomTickSpeed" gamerule to a high value in an attempt to increase the speed of the fire spreading.
/fill ~-3 ~ ~-3 ~-10 ~4 ~-10 minecraft:oak_leaves[persistent=true] /gamerule randomTickSpeed 300
Wait around thirty seconds and take note of how fast the fire spread.
Take note as to whether or not the "randomTickSpeed" gamerule affects the speed at which fire spreads.
Observed Behavior
The "randomTickSpeed" gamerule no longer affects the speed at which fire spreads.
Expected Behavior
The "randomTickSpeed" gamerule would affect the speed at which fire spreads, just like how it did in past versions of the game (1.12.2).
Code Analysis
Code analysis by @unknown can be found in this comment.
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Can confirm in 20w21a
Can confirm in 20w48a.
Can confirm in 20w51a.
Can confirm in 21w03a.
Can confirm in 21w17a.

I wonder why this hasn't been fixed yet.

..............

In 1.12.2 it affected fire spread. But I don't know when it was changed.
Can confirm in 1.17.1.
Can confirm this behavior in 21w42a. Here are some extra details regarding this problem.
The Bug:
The "randomTickSpeed" gamerule no longer affects the speed at which fire spreads.
Steps to Reproduce:
Summon a large number of leaves and ensure that the "randomTickSpeed" gamerule is set to its default value, (3).
/fill ~3 ~ ~3 ~10 ~4 ~10 minecraft:oak_leaves[persistent=true]
/gamerule randomTickSpeed 3
Ignite the leaves, wait around thirty seconds, and take note of how fast the fire spread.
Once again, summon a large number of leaves, but this time, change the "randomTickSpeed" gamerule to a high value in an attempt to increase the speed of the fire spreading.
/fill ~-3 ~ ~-3 ~-10 ~4 ~-10 minecraft:oak_leaves[persistent=true]
/gamerule randomTickSpeed 300
Wait around thirty seconds and take note of how fast the fire spread.
Take note as to whether or not the "randomTickSpeed" gamerule affects the speed at which fire spreads.
Observed Behavior:
The "randomTickSpeed" gamerule no longer affects the speed at which fire spreads.
Expected Behavior:
The "randomTickSpeed" gamerule would affect the speed at which fire spreads, just like how it did in past versions of the game (1.12.2).
Can confirm in 1.18.1.
This is happening because the randomTick()
method isn't present anywhere within the FireBlock.java
class, therefore making fire spread unaffected by the randomTickSpeed gamerule.
Can confirm in 1.18.2.

Affects 22w18a
Can confirm in 1.19.
Can confirm in 1.19.2.

Confirmed in 1.21.3