Put the summary of the bug you're having here

What I expected to happen was...:

chest should contain items 
What actually happened was...:
Certain chest do not have any items in them, these include; villarges, pillarges towers and broken never portals. 

chest that do spawn items include; mineshafts, underwater temples and ruins and desert temples.

Steps to Reproduce:
1. start a new world
2. explore world and chest 
3. ...