Samsung is very aggressive with its “battery saving” techinques. I have managed to get my S10 to do what I want it to do regarding all the automation (Synching run conditions, Tasker things, etc.) but it took me a couple of months of ironing out all the “app sleeping”, “power optimizing”, “background restricting”, etc., and I don’t even want to remember all the settings I had to overhaul nested deep in the menus.