Kelp grows in flowing water and creates water source blocks. The new source block spreads and creates new flowing water. By that a chain reaction happens which can create an infinite amount of source blocks
My realms world just updated and this completely destroyed my kelp farm which relyed on the mechanic that kelp would break off when it grew beyond the source block it was planted in and into the flowing block above it. (see Skippy6's automatic kelp farm on youtube for the mechanic)
This was an issue that was seen on the Java side, but wasn't opened for MCPE
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Still an issue in v1.8.0 as of 12/20/18
The original mechanics of kelp in bedrock actually worked very well. If it grew into flowing water, it would break. If someone wanted to create a vertically taller source block column, you would place a kelp on top of the previous kelp. I would advocate for a return to that mechanic.
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I have this problem currently on Windows 10. v.1.6.1
An important note when the developer who reads this gets to bug fixing is that kelp only grows into horizontally flowing water (thereby forming source blocks) when it is allowed to grow naturally into the last water source below the horizontally flowing water. This is hard to explain, but I will post pictures showing how to set this up (reproduceable) and what I mean.
Steps to reproduce:
1) Place a three high pillar of stone in the middle of a flat platform
2) Place a water source on the top of the pillar using a bucket. Water should flow on all sides.
3) Place kelp two blocks high on one side of the pillar. It could be manually placed one higher, but do not!
4) Place kelp three blocks high on the opposite side of the pillar. Notice that it cannot be placed any higher on this side.
5) Wait for the two block high kelp to grow. First it will grow into the downward flowing water, forming a water source at this location (as intended, I believe). This is now the same height as the second kelp you placed.
5) Wait further for the first kelp placed to grow into the horizontally flowing water adjacent to the original water source. Notice that a source block will be created at this location.
6) (Optional) Notice that further waiting does not result in the second placed kelp growing into the
If horizontally flowing water blocks are intended to be turned into source blocks (highly unlikely), then the behavior should be the same regardless if the player places the previous kelp block or if it naturally grows to that point.
Also, it is impossible to manually place kelp into horizontally flowing water. This would also have to be updated in the (unlikely) case that source creation is working as intended.
Why is this an awful bug? This bug is particularly annoying if you want to have a waterfall go into a water body full of kelp (a cosmetic building choice). The kelp will slowly create source blocks higher and higher, effectively raising the water level as high as the highest drop of the waterfall. This snowballs into potentially flooding massive areas of your world.
Edit: I am currently unable to upload pictures due to a browser error. Will do so as soon as possible.
Edit 2: Pictures currently uploaded. I added glass to make it clearer to see what is going on, but the setup is otherwise functionally identical.
Edit 3: Edited Edit 2 to include word "functionally". My editing habit is getting out of hand...