Bottom clamshell door popped open

[Timcote1960]

Today my bottom clamshell door popped open in flight shortly after takeoff. Wonder if anyone else has ever experienced that? Fwiw, my bird is pressurized and the door seal was activated. I was at a towered airport so I just let them know id return to land, and despite having 24” of open sky and a bit of extra drag, the Skymaster seemed to handle fine with its mouth wide open (lower half only. .

My wife had closed the bottom door, so I don’t know if it properly latched or not. It frightened her terribly when it opened. A bag of dried dates fell out, nothing else. We grabbed the dog; thank God she didn’t fall or you’d be reading about it on the news.

Anybody else have this happen?