It's pretty minor really, like a "technically not intended but generally no one cares if a few items on belts get pushed ahead up to a tile every now and then" kind of bug. Possibly the kind of thing that gets fixed with a +/- 1

Ref: https://forums.factorio.com/54693 Yeah it is likely a duplicate of the cause of that, you can see what areas get affected more clearly if you turn on "show-transport-lanes" in the debug menu. Interesting that nearby lanes without nearby merging get affected by their neighbours action...

Here a google drive folder with the mp4 of it happening, save and log file.
https://drive.google.com/open?id=12dEkh ... R_KeGM0tbG

When I replace belts near (about 5 tiles in radius I think) loosely packed items on the same bus they jump forward slightly. (I expect items on belts that aren't on the same belt to not be shifted around like there was some sort of strong wind) The amount they jump is significantly less for the yell...