I could not get it to happen with the safeties.
I partially disassembled it (removed the slide stop, removed the slide, removed the barrel, recoil spring/guide from the slide and then put the slide back on.)
I tried it with the safety OFF. I popped the ejector up/down, to the left, to the right (chewed the back end of a sharpie up pretty bad - used the sharpie so I could put some force on it and save my finger tip) and then tried pushing it downward and letting it pop upwards off the end of the sharpie several times. No (bad) luck in getting it to pop the left side safety partially out of the frame.
I tried it with the safeties moved upwards as far as they'd go with the slide not fully in position (pushed back so I could access the ejector with the end of the sharpie) and again, no amount of pushing, popping upwards, pushing right/left, etc. would cause that right side safety to pop part of the way out of the frame.
Maybe it has something to do with the effects of the extra spring the decocker requires.
All mine (P07's, P09's and the Urban Gray P01) all have the thumb safeties installed - it's a 1911 thing.
You know, when I took my P09 (the 9MM) to work on the sear, I lost the little piece of plastic on the right side safety lever and the safety lever fell out of the pistol while I was shooting it the next range trip. That was maybe 3 or 4 years ago and I don't remember if the pistol continued to fire or if it failed and that was when I noticed the right side safety was on the ground/leaves in front of me. But that is a separate issue (owner/operator headspace, not a pistol/design fault).