It happens whenever you swipe to select a watchface, which is very disorienting when you flick through a couple different ones.
It’s wasn’t a thing with watchos 9 and it seems almost like a bug that was just accepted during the watchOS 10 betas and is caried on to watchOS 11.
I think it’s ugly. I often switch from one face to the next, as I have Analog Modular in between others which don’t have weather data, so I flick over as it’s easier and more compact than the widget page thingy, but am greeted by some spazzing out clock hands. Every time, with every (analog) watch face. The digital ones at least only show a completely wrong time for a second and don’t move much, but it’s still ugly.
I guess the fact that Reduce Motion doesnt stop this from happening is another indicator that it’s a half hearted „feature“ that serves no actual purpose and is only there bcause.
Mind you, I think the first time this behaviour was „introduced“ was with the watchOS 10 beta that removed the Swipe between Watch Faces feature, and we only got that back after people complained.
Apparently we didn’t complain enough about that beta.