Base despawned

Trying out the demo to see if it was worth the buy, Logged in 4 hours base building & exploring. Logged back in & boom all items stored & built structures gone. Which is a HUGE deterrent as why did i just spend 4 hours collecting & building to have to do it all over again & lose every item i had stored. Its not that simple to just start over when i need to regrind all my materials, like just the items ill need to get again just to get my ppls work stations going again is going to be a drag