I was running late so I sent my girlfriend to pickup my car that was charging at a public ChargePoint station about 10 minute walk away. I gave her the key to the car but not the ChargePoint card. Up to this point, she had only seen me charge the car and had never actually done it herself. Not knowing that you're only supposed to push the button to deactivate the charge, she pushed the button when removing the j1772 charger from the car. When she pulled, the charging cable came detached from the adapter, but the adapter was still attached to the car. At this point, the only way to remove it was to swipe the ChargePoint card (which she didn't have at the time) or pull the manually release cable (which she didn't know about). Needless to say, I did not make it to my appointment on time.
I feel like clicking on the charge point door icon on the car's monitor should allow the adapter to be released in these cases.