I'm pretty sure I've seen this listed as something people know about, but since there's no message and thus it's not working as I expected which meets the description of a defect I have to deal with at work =)
A few skills ago, I started better learning V. It was like 9 days. After I started it, I saw another one I wanted, so I jumped over to it and popped it on. After it finished, I restarted BL5. It has, since I got it, said I'm learning fast, but the ticker is running at normal speed. I still have over 7 days to go.
There was a warning I'd lose speed when I've switched tasks before (no idea if I got one on this skill, as I didn't even understand what this meant before), but never a warning that not only would I lose speed, I'd lose the ability to ever move a task at speed again. Either that should be in the popup/description, or it shouldn't happen.
That's one Glitchian's opinion.