@idefix37
Thanks for your comment !
We are talking about small quantities of rain, of course. In general below 0.4mm you even don’t really notice it if you are outside ! It could be related to the the way it is rounded but as you highlight, the 0.5mm is harder to explain.
I wanted to mention it again to be sure it is not related to something else, sometimes small inconsistencies like in the case here hide in fact a bigger problem. Windy team should just comment and confirm.
I can monitor it during the coming days/weeks, especially a day with much more rain to see if the difference 3h/1h rain forecast remains still small or not