I also noticed when uninstalling apps from settings once the app is uninstalled I get the spinning circular icon and will spin constantly until I force Quit to home not much if an issue but the screen wont time out so expect the battery to drain or screen burn, heat etc.
I think i get which circle you mean, but for me it appears only briefly.
So please be sure to share an error report with us via Beta Feedback option in Samsung Members app.
Our development team will have to take a look at that
Yes it's the loading circle usually appears after updating when its due to shut down mine was spinng for a long time a lot longer than it should so I will try it again sometime today as it might just be a cache problem so I didn't report it as a bug as such