I'm not sure if this is a bug or me being blind but I'm trying to make seagrass spawn in another dimension (twilight forest id 7 ) but it is not working. Is there something wrong with this code ?

#Biomes in which this plant/ore can generate. For Mod-Biomes: modid:biome_name. Definitely supported mods: BiomesOPlenty.
S:biomes <
twilight_stream
twilight_lake
>

#Dimensions in which this plant/ore can generate.
I:dimensions <
0
7
>

I tried with all of this as well:

            twilight:twilight_stream
            twilight:twilight_lake
            7:twilight_stream
            7:twilight_lake
            twilight:stream
            twilight:Lake
            7:stream
            7:lake
            stream
            lake

So first of all there is a comment which explains how to add new biomes. It says "For Mod-Biomes: modid:biome_name". That would be twilightforest:twilight_stream and so on.
The problem is that the twilight forest isn't properly coded. What i mean is that when i want to get the sea level of the current world (world = dimension) then it isn't returning me the sea level of the twilight forest but the default sea level of 63. And so there won't spawn any plants in that dimension.