--note, this bug does not seem to work in all positions, a attempt to build it at a different location does not produce a crash
game crashes when a structure block overrides container blocks moving and dispensing items.

To Reproduce:

(note, this works facing any direction, the use of direction is for simplicity

1. place a dropper on the ground, facing north.
2. place a hopper so that it is facing into the dropper, in such a way that if items were inside it they would flow into the dropper.
3. place three hoppers one facing north, one east, and one west, each so that their contents would flow directly into the hopper from step two
4. power the three hoppers placed in step three
5. put one stack of items in each of the hoppers from step three, the items should be 64 stack able, and different, I used three different colors of concrete in the example
6. place a structure block to the east of the dropper and put it on 'save' mode
7. set the structure blocks relative position to -2, 0, 0.
8. set the structure blocks size to 3, 1, 3
9. save the structure as test
10. put the structure block in load mode, with the same relative position and the name 'test'
11. place a repeater facing into the structure block from its eastmost side.
12. place a block to the east of the repeater
13. place a button on top of the block
14. unpower all hoppers
15. wait about 30 seconds
16. push the button
    expected result:

• an item will be dropped
• the hoppers will be refilled
  actual result
• the game will crash