Dieing because of coming close to vehicle/people/doors/props

[Pollux]

It isn't the prop, cars or people. I have found that it occurs one you have been hit by a car and knocked out, the 'press jump to die' message appears. Then after respawn when you next press space you drop dead.
In this video it looks as if that might be the case too.

I don't think it occurs if you press space when ran over, but I never jump when I am in that state.

That is actually very interesting, I'll add measures to identify if this is the cause.