The rainfall in the mangrove swamp does not match that of the regular swamp.
I honestly don't know which is correct, the mangrove swamp or the regular swamp.
Normal swamp differs from mangrove swamp and normal swamp in Java Edition, but mangrove swamp matches mangrove swamp and normal swamp in Java Edition.
In other words, the downfall of the mangrove swamp and regular swamp biome is the same in Java Edition.
downfall
** swamp: 0.5
mangrove swamp:0.9
However, the mangrove swamp, and the color of the grass block on the regular swamp, has little in-game impact, as it does not affect temperature or downfall.
Steps to Reproduce:
1.Compare the "mangrove_swamp.biome.json" and "swampland.biome.json" downfall in the "definitions/biomes" folder.
Observed Results:
mangrove swamp and swamp downfall values are different
Expected Results:
mangrove swamp and swamp downfall match.
Linked issues
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I can confirm that the swampland downfall has been changed to 0.9 to match Java Edition. However, the swampland_mutated downfall has not been fixed. This is reported as MCPE-189877.
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The correct thing would be for the swamp biome in Bedrock to have downfall: 0.9. Since when the downfall is high >0.85 the biome is considered humid which would be correct because the biome is very humid. So the behavior of the mangrove is correct. This information took you away from https://minecraft.wiki/w/Biome#Climate