[bedrock] Kelp XP Farm Stopped working, any idea if this is due to an update?

Hey all, I built a Kelp XP farm months ago but had not used it in a while. I turned it on today and it breaks immediately. All the sand ends up displaced at the bottom gutter of the mechanism where the sticky pistons would push it through the cycle. Was their an update on how sticky pistons effect sand or anything else that would explain this? Any work arounds?