No doubt it does. Have seen and experienced "mag fallout" too from time to time. Usually good to give 'em a good whack and check to see if mag's latched in place. Some may look to be, but aren't.Several of them were claimed later and indeed they had been ejected, so it does happen.
Of course it is always good to check occasionally, but I still believe a spare magazine is cheap and easy insurance.
Carrying 2 full mags is generally a good idea too. Also, good to carry two full mags on opposite side of carry to reduce "people wobble" too. - Helps balance on shoulder holsters or CC upper clothing concealment because things generally hang / look better, more normal. Two mags seems to be "magic number" with many.