Conjugating 'used to'

[eruiluvatar]

Hello. I was reading a manga today and there was the following sentence in it:
"Did you used to teach?"
Obviously the localisation team are professionals, but professionals can make errors too.
It must be a typo right? You conjugate 'used to' like a normal verb.

[Joe]

The correct English form is:
"Did you use to teach?"

Please see:
https://www.englishclub.com/grammar/ver ... -to-do.htm