So I noticed that water source blocks does not propagate under any circumstances. This causes flowing water to be formed when placing a block in the middle of a river and breaking the block, even underwater. The only way this can be remedied atm is by turning on the ability to place source blocks, which is a real shame. This can be overcome by allowing water blocks to propagate e.g. if an air block is surrounded by 3 source blocks of water, it should also be turned into a source block. This mitigates the ugly flowing water in places it shouldn't be without requiring the player to enable an immersion breaking feature that allows you to place source blocks.