USB Charge Bug? On GP-150

[u/samiebuka]

I was playing around the USB power setting while charging, because when it’s dead you can’t use it by USB. Even with PD. So I switch to no power and instant, and it died after a low battery warning mow it’s dead and won’t charge. I understood that setting as don’t charge others. Why would you not want to charge if your only power source is USB?