If you’ve got a spare card, run lf t55xx wipe on it - I’ve had weirdness with detecting em emulating T5577 chips. When you scan you should find your t55xx chip. I’ve also used this to unbrick an xEM.
I’ll add that you can also try lf t55xx read and lf t55xx info and report back if you prefer. Also lf t55xx dump will give us all pages