optimize-explosions no longer works correctly in 1.21.3/2

[Samsuik]

Expected behavior

The same behaviour prior to the 1.21.3/2 update.

Observed/Actual behavior

The explosionDensityCache is not cleared anymore after the 1.21.3/2 update which causes issues with explosions interacting with entities

Steps/models to reproduce

/fill -17 -55 -72 -17 -55 -70 minecraft:bedrock
# Observe how explosions interact with this entity
/summon minecraft:tnt -16.5 -54.00 -69.5 {fuse:10000}
/setblock -17 -54 -71 glass
/summon minecraft:tnt -16.5 -54.00 -71.5 {fuse:10}
# The entity will not move even though the obstruction has been cleared.
/summon minecraft:tnt -16.5 -54.00 -71.5 {fuse:10}

Plugin and Datapack List

n/a

Paper version

Checking version, please wait...
This server is running Paper version 1.21.3-1-master@f273e6e (2024-10-31T17:32:23Z) (Implementing API version 1.21.3-R0.1-SNAPSHOT)
You are running the latest version

Other

The optimize-explosions patch was not applied correctly during the 1.21.3/2 update. The line that clears the explosionDensityCache was moved into the MinecraftServer constructor before the update it was ran every tick in the tickChildren method.

https://github.com/PaperMC/Paper/blob/ver/1.21.1/patches/server/0043-Optimize-explosions.patch
https://github.com/PaperMC/Paper/blob/master/patches/server/0043-Optimize-explosions.patch