No, that is false. I named it to +800 and tried the colon to see it that helped, and it doesn't. I did NOT try to name it that, I meant to name it +800
What is that supposed to mean
The Dev Console Showed nothing odd, and my timings were very off unlike yours. Plus, deleting, and re-putting the file included here still had the tick-lag. So I'm not very sure, but I have remade the world once, and copied a build using MCEdit that I made in the world itself, and it started doing the tick-lag, I did check before that and it was not doing that. So now, I'm remaking it again, and not doing the same things now.
This bug is shown on YouTube videos, and because how much it happens I wonder if it is a bug, because when in creative zombies, skeletons, etc. will still try to attack you.
Teleport to X: 1594.5 Y:18 Z:-392.5
Then answer me this if you could. How is it if I rename other things the same name, it works.