200V2 low DC output doesn't show on display?

I just noticed that when charging my Samsung watch at ~2W with USB-C, the watch was being charged but the display show 0 output. Then I used a different device that took ~8W from USB-C and it showed up fine on the display. Is this a known bug? Not just USB-C, same for USB-A. Looked like anything below 6W or 7W doesn’t show? Thanks!

Not a bug, it’s likely that the load W are much less than system use and doesn’t trigger. I have a 240VAC electric toothbrush charger that draws less than 10W, it doesn’t show on the display for AC either.
I have a spare 150W PSW inverter that I run of my RV batteries, so I use that for the T/B charger as self consumption is greater than the load on my AC70 or AC180.

Thanks for the input! You said it right, “when the load is less than the self consumption”, it can’t know! I just did a test with my own AC and DC power monitors that I just posted in another thread here to confirm the overhead. Thanks again!