To repair Twilight forrest biomes appearing in overworld change biome ids (for example from 112 to 212, from 150 to 250 ect...) in twilight config in config file.

working file:

Configuration file

biome { I:biome.id.Clearing=225 I:biome.id.DarkForest=239 I:biome.id.DarkForestCenter=237 I:biome.id.DeepMushrooms=236 I:biome.id.EnchantedForest=241 I:biome.id.FireSwamp=242 I:biome.id.Glacier=224 I:biome.id.Highlands=219 I:biome.id.HighlandsCenter=238 I:biome.id.Lake=216 I:biome.id.LightedForest=235 I:biome.id.Mushrooms=220 I:biome.id.OakSavanna=228 I:biome.id.Snowfield=223 I:biome.id.Stream=222 I:biome.id.Swamp=221 I:biome.id.Thornlands=243 I:biome.id.TwilightForest=217 I:biome.id.TwilightForestVariant=218 }

dimension { # What ID number to assign to the Twilight Forest dimension. Change if you are having conflicts with another mod. I:dimensionID=9

# Dimension provider ID.  Does not normally need to be changed, but the option is provided to work around a bug in MCPC+
I:dimensionProviderID=-777

}

general { # Allow portals only for admins (ops). This severly reduces the range in which the mod usually scans for valid portal conditions, and it scans near ops only. B:AdminOnlyPortals=false

# Allow portals to the Twilight Forest to be made outside of dimension 0.  May be considered an exploit.
B:AllowPortalsInOtherDimensions=false

# Disable Twilight Forest portal creation entirely.  Provided for server operators looking to restrict action to the dimension.
B:DisablePortalCreation=false

# Disable the uncrafting function of the uncrafting table.  Provided as an option when interaction with other mods produces exploitable recipes.
B:DisableUncrafting=false

# Use old (pre Minecraft 1.7) map gen.  May not be fully supported.
B:OldMapGen=false

# Item to create the Twilight Forest Portal.  Defaults to 'diamond'
S:PortalCreationItem=diamond

# Make cicadas silent  for those having sound library problems, or otherwise finding them annoying
B:SilentCicadas=false

# If set, this will override the normal world seed when generating parts of the Twilight Forest Dimension.
S:TwilightForestSeed=

}

performance { # Amount of canopy coverage, from 0.0 on up. Lower numbers improve chunk generation speed at the cost of a thinner forest. D:CanopyCoverage=1.7

# Chance that a chunk in the Twilight Forest will contain a twilight oak tree.  Higher numbers reduce the number of trees, increasing performance.
I:TwilightOakChance=48

}