When creating your own biome using the datapack, you have the option to set the water fog color.

However, two major mistakes/issues follow.

• If the water fog is set to a dark color spectrum approaching black. The fade in animation of the transition between the colors of the oceans (water fog) is instant without the fade animation along with a 5 second delay that is there for the missing animation.

Basically when Water fog color is set to dark color or close to black, fading animation is missing.

• If the water fog is set to 0 means Black, water fog turns into white instead. 

Both issues are basically same bug and issues that are caused by darker colors for/from  biome water fog. 

Update and instructions:

• The dark and black color should make the water fog black with a smooth transition between the colors of another biome.

• You can see in the video that the transition between colors does not exist for the dark and black colors that we added to the datapack for demonstration.

• Reproduction is simple. just add the folder from the "bugreference datapack" (folder named raftblock) to the temp. datapacks folder at world creation, create the world and then summon or find this biome (as it is generated). You will witness that the "fade in transition for dark colors / black color of water fog is missing and buggy.

- What should happen? smooth change between blue water (fog) to black (fog) [same effect when u go from swamp to cold ocean].

• what's actually happen? no smooth change and instead it changes instantly after 5 seconds.

• You don't necessarily need to work with our datapack. you can use your own. It is about the color code that is used. the darker they are, the worse the game renders this color and bugging it bcs of prioritizing. 

• command: /fillbiome [coordinates][coordinates] raft:abyssal_ocean

New video where do we reproducing this bug from the start to the end: https://www.youtube.com/watch?v=VQSNLoXvaMI

• Goal is fix the transition for dark colors / black color to have transition of fog color (gradient) when i step into biome from the blue to dark/black and when i leave the biome from black/dark to back blue. that's how it should be.