@Brad_Olwin, thanks!
Yesss, seems to be something wrong, yeah… Support told me to send it to them.
Already tried soft-reset (hold 12s uppper-right) sometimes makes the arrow disappear, but it happer again some hours late.
The same with hard-reset (usb connection with pc running SuuntoLink) also suggested by SuuntoLink, which then tries to update, fails a few times, then completes, but hours later the arrow happears again.
Also tried many times the soft-reset as requested by the support, leading the watch to a new state with the display showing a message I don’t remember but inviting to ask them.
So I am waiting for them to solve this, happeared after upgrade 😞