The Bug
Weird potion blue / gray particles from arrows.
How To Reproduce
Shoot one or more regular arrows on ground or on a wall
In Survival for easy travel can be used Minecart
Go away from these chunks with arrows to unload completely (If using 8 Chunks Reder Distanse, travel more than 400-500 blocks away)
You can relog your world or the Server, works too
Go back to the arrows and they have weird blue / gray potion particles
Duplicate of MC-107941, if you have not, please use the search function in the future.