Experienced almost exactly the same issue last night (Friday) but no warning signs that anything was wrong. My ‘top range’ lx had just undergone its 10k service the day before. Reversing out of driveway in the dark and heard something fall on the centre console, tried to select park then realised it was part if gear shift handle that had fallen off. On closer inspection in the dark, I noted that the black plastic part of the shift release knob had disintegrated into about 10 small pieces, some of which had lodged in the shift mechanism, so couldn’t shift into park. To add to the mayhem and chaos, once I worked out what was going on and how to manually override the selector safety mechanism to put in park, I was unable to turn off the ignition! I could stop the engine, but the ignition remained in accessory mode! An unseen piece of broken plastic was still lodged in the shift mechanism, and although in park, was somehow causing this issue. After I removed this piece and put transmission back into park again, it allowed me to turn off the ignition. Of course, now being a Saturday morning, Honda service departments are not open. I managed to speak to a parts department from one of the dealers who informed me this is not the first he has heard of this issue. I do hope Honda is going to re-engineer a whole new button from more sturdy materials