They almost always occur in car parks/when manoeuvring. With the interaction between creep/hill hold/regen/opd and changes of direction there’s a lot going on (for the driver). Gently holding the brake just the right amount to control your creep to move forward to slowly park feels very similar to gently holding the accelerator just the right amount to move forward to slowly park if there’s a hill or gravel or mud involved, for example.
I have made the reverse mistake (many years ago in a Prius), thinking I was gently holding the accelerator going through a roundabout, then wanted to speed up. I pushed the pedal and slowed down, pushed harder and hit a dead stop. If I can make that mistake then it’s very easy to believe people make the reverse mistake. Only takes a minor distraction, something on the radio, seeing something odd out the window, thinking about another car while operating this one, being in a different emotional state, or simply being in a rush.