I have been getting this and it is very annoying and disappointing...
I haven't installed the experimental and am playing on the "stable" version.
Every time this crash pops up it is when my vehicle has hit something. The worst case was my gyrocopter hit a street light and I got the crash, then I loaded into the world again and my gyro was gone. Drove my bike to a trader quest, finished the quest and began driving to the trader, then got teleported on my gyro nowhere near where I just was.
Then reloaded the world just in case and my toolbar was wiped. This was a 40 hour world and was my first proper A20 world...
I now am paranoid every time I play and backup my world every 15 minutes or so.
They will never fix it either...