I did some testing stuff on Minecraft 1.10.2 and 16w33a, but when I tested something to do with potions, I drank a Poison Potion, but when the Potion effect was done, the particles that play when a potion is in effect did not go away. I even tried drinking Milk, the particles were still there. I tried drinking the potion again and drank Milk, but the potion particles just didn't stop. I exited the world and then opened it again, but the potion particles were still there. I had to close the game, then open the game again to fix it. For some reason this didn't happen in Snapshot 16w32b, and it didn't happen on any servers.