modified difficulty remains Easy

[dreamalligator]

Client version: 1.11.2
Server OS: Ubuntu 16.04.2 LTS (GNU/Linux 4.4.0-72-generic x86_64)
Commit id: 6c420ce5570ca4ac2aa5cabf80c3fa743d11ecf2

Expected behavior

game mode difficulty set to hard

Actual behavior

game mode still set to easy

Steps to reproduce the behavior

I modified my world.ini and restarted Cuberite, but the game difficulty found still still Easy.

cat world.ini 
[SpawnProtect]
ProtectRadius=10

[WorldLimit]
LimitRadius=0

[Difficulty]
WorldDifficulty=3

[General]
Dimension=Overworld
UnusedChunkCap=1000
IsDaylightCycleEnabled=1
Gamemode=0
Weather=0
WorldAgeMS=29169459
TimeInTicks=8716

[Broadcasting]
BroadcastDeathMessages=1
BroadcastAchievementMessages=1

[SpawnPosition]
MaxViewDistance=12
X=0
Y=66
Z=0
PregenerateDistance=20

[Storage]
Schema=Default
CompressionFactor=6

[Plants]
MaxCactusHeight=3
MaxSugarcaneHeight=3
IsBeetrootsBonemealable=1
IsCactusBonemealable=0
IsCarrotsBonemealable=1
IsCropsBonemealable=1
IsGrassBonemealable=1
IsMelonStemBonemealable=1
IsMelonBonemealable=0
IsPotatoesBonemealable=1
IsPumpkinStemBonemealable=1
IsPumpkinBonemealable=0
IsSaplingBonemealable=1
IsSugarcaneBonemealable=0
IsBigFlowerBonemealable=1
IsTallGrassBonemealable=1

[Physics]
DeepSnow=1
ShouldLavaSpawnFire=1
TNTShrapnelLevel=2
WaterSimulator=Vanilla
LavaSimulator=Vanilla
SandInstantFall=0
RedstoneSimulator=Incremental

[Mechanics]
CommandBlocksEnabled=0
PVPEnabled=1
UseChatPrefixes=1
MinNetherPortalWidth=2
MaxNetherPortalWidth=21
MinNetherPortalHeight=3
MaxNetherPortalHeight=21

[Monsters]
VillagersShouldHarvestCrops=1
AnimalsOn=1
Types=bat, cavespider, chicken, cow, creeper, guardian, horse, mooshroom, ocelot, pig, rabbit, sheep, silverfish, skeleton, slime, spider, squid, zombie

[Weather]
MaxSunnyTicks=180000
MinSunnyTicks=12000
MaxRainTicks=24000
MinRainTicks=12000
MaxThunderStormTicks=15600
MinThunderStormTicks=3600

[LinkedWorlds]
NetherWorldName=world_nether
EndWorldName=world_the_end

[Generator]
Generator=Composable
BiomeGen=Grown
ShapeGen=BiomalNoise3D
CompositionGen=Biomal
Finishers=RoughRavines, WormNestCaves, WaterLakes, WaterSprings, LavaLakes, LavaSprings, OreNests, Mineshafts, Trees, Villages, TallGrass, SprinkleFoliage, Ice, Snow, Lilypads, BottomLava, DeadBushes, NaturalPatches, PreSimulator, Animals
BiomeGenCacheSize=16
BiomeGenMultiCacheLength=128
SeaLevel=62
BiomalNoise3DFrequencyX=40.000000
BiomalNoise3DFrequencyY=40.000000
BiomalNoise3DFrequencyZ=40.000000
BiomalNoise3DBaseFrequencyX=40.000000
BiomalNoise3DBaseFrequencyZ=40.000000
BiomalNoise3DChoiceFrequencyX=40.000000
BiomalNoise3DChoiceFrequencyY=80.000000
BiomalNoise3DChoiceFrequencyZ=40.000000
BiomalNoise3DAirThreshold=0.000000
BiomalNoise3DNumChoiceOctaves=4
BiomalNoise3DNumDensityOctaves=6
BiomalNoise3DNumBaseOctaves=6
BiomalNoise3DBaseAmplitude=1.000000
CompositionGenCacheSize=64
RoughRavinesGridSize=256
RoughRavinesMaxOffset=128
RoughRavinesMaxSize=128
RoughRavinesMinSize=64
RoughRavinesMaxCenterWidth=8.000000
RoughRavinesMinCenterWidth=2.000000
RoughRavinesMaxRoughness=0.200000
RoughRavinesMinRoughness=0.050000
RoughRavinesMaxFloorHeightEdge=8.000000
RoughRavinesMinFloorHeightEdge=30.000000
RoughRavinesMaxFloorHeightCenter=20.000000
RoughRavinesMinFloorHeightCenter=6.000000
RoughRavinesMaxCeilingHeightEdge=56.000000
RoughRavinesMinCeilingHeightEdge=38.000000
RoughRavinesMaxCeilingHeightCenter=58.000000
RoughRavinesMinCeilingHeightCenter=36.000000
WormNestCavesSize=64
WormNestCavesGrid=96
WormNestMaxOffset=32
WaterLakesProbability=25
LavaLakesProbability=10
MineShaftsGridSize=512
MineShaftsMaxOffset=256
MineShaftsMaxSystemSize=160
MineShaftsChanceCorridor=600
MineShaftsChanceCrossing=200
MineShaftsChanceStaircase=200
VillageGridSize=384
VillageMaxOffset=128
VillageMaxDepth=2
VillageMaxSize=128
VillageMinDensity=50
VillageMaxDensity=80
VillagePrefabs=PlainsVillage, SandVillage
BottomLavaLevel=10
PreSimulatorFallingBlocks=1
PreSimulatorWater=1
PreSimulatorLava=1
HeightGen=Biomal

[WaterSimulator]
Falloff=1
TickDelay=5
NumNeighborsForSource=2

[LavaSimulator]
Falloff=2
TickDelay=30
NumNeighborsForSource=-1

[FireSimulator]
BurnStepTimeFuel=500
BurnStepTimeNonfuel=100
Flammability=50
ReplaceFuelChance=50000

[Seed]
Seed=1870404900

[WaterSprings]
HeightDistribution=0, 0; 10, 10; 11, 75; 16, 83; 20, 83; 24, 78; 32, 62; 40, 40; 44, 15; 48, 7; 56, 2; 64, 1; 255, 0
Chance=24

[LavaSprings]
HeightDistribution=0, 0; 10, 5; 11, 45; 48, 2; 64, 1; 255, 0
Chance=9

[Animals]
AnimalSpawnChunkPercentage=10

[djlw78]

It's a protocol error, but it's not suppose to change from minecraft client, it will still be difficult three in the server.