Turner did the same thing a second time immediately afterwards. They did not manage to capture either of them.
However, I did notice upon zooming out that two separate critters within the same space that were nowhere near Turner had been wrangled: a completely different puft at the end of the small storage area, and a shinebug at the middle left of this image.
As far as I'm aware, flying creatures have to be directly called over to the Critter Drop-Off (with auto-wrangle enabled) in order to be captured, so I can only assume that the reason Turner didn't capture the two pufts they called over is because they decided to do a trickshot roughly 40 squares away.
Steps to Reproduce
I'm not entirely why it happened, but first thing you need is the Critter Drop-Off with the box checked for auto-wrangle. In my setup the space these critters are in is 6974 tiles according to the room overlay, and the Critter Drop-Off says there are 34 critters in the area. Maybe the size contributed to the bug?
This issue has not been confirmed by a developer yet.