Flickering screen when charging all new 1040, why is that?

It probably has more to do with functionality than quality of the charger (or both), since several people have had various results with good quality name brand chargers (like Samsung, Apple, etc.). It's frustrating we haven't figured out which factors cause the issues though. We know that very basic chargers (like ones that only support standard 5V/500mA USB charging, like on USB 2.0 ports) work. We also know some USB-C chargers work, and that some USB-C chargers lead to issues, even if those chargers are according to USB spec and work fine with everything else. It would be very valuable to know which factors cause issues. Is it support for higher voltages? Is it support for higher amperage? Is it support for certain technologies, like PPS? We do know there is a problem with the device, since it shouldn't 'ask' for the wrong combination of voltage and amperage, but what exactly triggers the issues remains unclear. The stance Garmin has taken (to only use standard USB ports or their chargers and their cables, they won't investigate issues when not meeting these demands), while not uncommon, also isn't helping. It goes against the whole idea behind USB (Universal Serial Bus) and behind EU regulations, forcing companies to all use USB in order to counter the need for proprietary chargers and cables, and the waste those cause.