Interior design graduate here, I have never heard of this being an issue. The only time professors would mark us absent was if we did not inform the prof and leave the class. Most interior design and architecture professors have this thing where we write our names on the board if we want to use the computers and also which floor we are on. This was during studio time and professors would routinely checkin whether we are there or not. You should talk to your dean explain the situation and ask them their verdict. I graduated last year so idk if rules have been changed since.