This is from the latest non-bleeding snapshot (https://ldtteam.jfrog.io/artifactory/parchmentmc-public/org/parchmentmc/data/parchment-1.21/2024.07.28/parchment-1.21-2024.07.28.zip)

The charge variable is duplicated twice, which looks like an error in the mappings, but it doesn't seem to be the case in this repo:
https://github.com/ParchmentMC/Parchment/blob/versions/1.21.x/data/net/minecraft/world/level/biome/MobSpawnSettings.mapping#L62