When I put the water in a certain setup with sea grass placed underneath, it will turn invisible.

I expected the water to just stay visible, however this was not the case

It turned invisible

How to reproduce:
1. Place two strips of blocks, 8 long (so the water flows all the wat to the end)
2. Now put a block on one of the far ends to prevent the water from going both ways
3. Increase the height of the block that stops the water from flowing both ways by 1, do the same for the two closest blocks on the 8-long strips
4. now place a water source block on the first layer of the closed off section
5. place a water source on the second layer of the closed off section
6. now place 8 blocks of sea grass on the blocks underneath the water, going from closed off to the open side
7. now you will see that on both sides there is 1 block where the water flows over the edge. place blocks on these blocks. here the water should turn invisible