This is my setting

"Time before the loot despawn in seconds": 30

I just noticed that its not waiting 30 seconds. It empties the container right after I exit the container

Your configuration file is not up to date ;)

{
  "Empty the airdrops": false,
  "Empty the crates of the crashsites": false,
  "Time before the loot containers are empties": 30
}

oh. didnt know the config changed :) thanks