@Fletchasus After updating the bios to 305, I let the battery run down to <20%, then plugged in the power supply and charging resumes as it should. I will update with the new one sent by @Blake_ASUS and report the result.
I just got exactly the same issue with an UM425IA-AM005TI shut down the laptop, connect power supply and it charges again, so it goes over 20% and I updated the BIOS to 305 (out today 8/31/20)Hope the bios update solves the issue.
