That made me think of tape pulls for some reason. About a third of my books still have flaps closed with tape. I need to get on the ball and fix that. "Careful" doesn't work long term.
Tape goes on only after book is safely in new sleeve, and old tape gets cut as I am going to replace the bag & board anyway. I have had one tape-pull in my life, and I vowed never again. The way described above has kept me honest on that vow.