The video of the bug present is attached but it won't play in my browser, probably because it is h265 encoded. To watch the video download 03.mp4.
I can confirm. Though the issue is also present for us on PC and Laptop as well since 1.15.
I see! So that means if I let the kelp block grow 3 blocks high and I put one row of active water above the observer it should work? like: https://ibb.co/m6gkLr3 This?
But the water CAN reform. There are active water blocks under it and above it. As soon as the piston draws back a new water block froms. Furthermore farms based like this work online. Why won't they work for me?
I can confirm too that this is very relevant in 1.18 official release. I used to put a great deal of effort into making world generation data packs for me and my friends for different playstyles such as: ocean only world, desert only world, winter apocalypse etc. Customizing structures was a core part of it and now you cannot edit which structures will start in different biomes... This is highly frustrating.