Don't usually break strings at all - maybe once or twice, Louis Johnson style, pulling the G a little too vigorously during a slap solo in my younger days ...
That said, I went through a phase where I broke three D strings in quick succession on my short scale, no slapping or pulling, just fingerstyle. Didn't seem right, so I took the bass in to my tech and he diagnosed a burr on the D string saddle, filed it down gently and it's never happened since.
I wouldn't have thought shorties would be any more prone to string breakages than long scales. In fact, since the tension feels lower, my gut instinct says they'd be less prone to breaking, wouldn't they?