So I was working on a few command blocks in my survival/faction realm. I didn't want players to get annoyed by the mobs in the hub so I did what almost every faction maker did. I placed down a repeating, always active command block and typed in a command involving "@e". (/kill @e[r=140]) Then players started telling me that they were repeatedly getting killed at the hub. Then I tested it out it adventure mode and as soon as I pressed enter it would start killing me in a radius of 140 blocks even though I used "@e" instead of "@p". So, yeah just wanted to point it out there. It's probably just a bug in the 1.13.0 update, but anyway hope you can fix this. Thanks!