Seems abnormal to me.. on power down state
I never noticed this before with any other phone but I also never paid much attention. I rarely actually power my phone off completely but I did yesterday and left it charging. Black screen white battery. The usb cable i was using didn't have a tight connection so if i moved the cable it would break connection and it would stop charging then resume charging in a matter of a second.
The weird part is when the usb lost connection and resumed you can clearly see TWRP in the background dimmer than normal but clearly twrp. This last about a minute before the screen just remains black regardless if the usb connection was lost. At first I thought I accidently hit recovery so powered it down again and wiggled the cable, white charging battery goes away and TWRP is definitely running. Any ideas or explanation why this does this?