I was just able to trigger a new achievement, so I think they're still in 2.1 just being saved until stable release.

EDIT: Further research shows this is likely caused by the "Nanobots: Early Bots 2.0" mod. Issue was reported here:
https://mods.factorio.com/mod/Nanobots2/discussion/67f29b1c3446617b13b9af32

I've been able to replicate this by placing a blueprint with higher than normal quality and having the item ...

TL;DR
A keybinding with a similar function to holding Ctrl in Windows task manager, that pauses the updating of item order in the production window.

What?
This keybinding, while held down, would still allow for values and graphs to update, but would pause the sorted movement of individual items ...