If I'm watching something quite long on live TV like a film and pause to take a phone call and after the end of the call I unpause and delayed playack of the programme continues.
But if there are adverts and I try and skip over them with the number number keys I soon come to a point where if I overshoot and need to skip backwards I find I can't and I miss a part of the film.
Happened just now with "The Stanford Prison Experiment" on ITV4.
It's unacceptable for a timeshift feature to do this.