I was using the water effect on a sprite object in a recent project and found these strange visuals when spawning another sprite object(no effect) with a pinned particle tail on top of the first. It creates these very ugly 'boxes', I found using a sprite object as a custom particle doesn't cause this issue(so I figure it's something to do with the interaction of the particles type object and the water effect). For my project, ill find a workaround, but I wanted to mention it anyway. Cheers.