i think i got same issue with my Sandisk Ultra 64gb,
SDFormetter says its “Write Protected” but its not the Switch on the Adapter.
if i check the via CMD, Diskpart in Windows the Volume or Disk Details it tell me no Write protec or ReadOnly and succesful clean.
nevenmind what i do, delete or copy new data on it, after plug out and back in the Data state is resettet. Same in my Phone, can use it till i unplug the card or reboot phone, microSD card will reset to the current state.
In Linux using gparted i got an “unable to write format changes into kernal” error, that looks like the Card locked itself like said here: