The bug
In 1.9.2, they added the feature of hoppers being able to pull items out of blocked chests. However, comparators don't give output when they are blocked & have items in them.
Video proof: https://www.youtube.com/watch?v=JNRTYOqBneU
How to reproduce
Get two chests, fill them with items
Put a solid block on top of one of them
Put comparators facing away from them
One will give signal, while the other won't
While some older reports of this got "resolved" by marking it as intended, isn't a bit weird that now items can go through chests with blocks on top, you still can't get a signal out of them?
Linked issues
is duplicated by 4
relates to 3
Attachments
Comments 31
Is this still an issue in the latest snapshot 16w44a? If so please update the affected versions.
This is an automated comment on any open or reopened issue with out-of-date affected versions.
As I showcased in my own bug report its not only stopping comparator from detecting contents but if you place full block over chest then comparator, destroy block over comparator, place block over chest on opposite side of comparator and break first block over chest then remaining it causes comparator to not detect items from chest but chest itself is not being blocked, and you can access its inventory. To make the comparator work again, you need to cause it to update (placing a block next to it works)
Can confirm in 25w31a. This bug also applies to trapped chests and copper chests.
This bug also affects copper golem mechanics as a side effect. Because copper golems tend to look through chests when they don’t need to, but are unable to open blocked chests, it’d be useful to use comparators and sticky pistons to control which chests golems will interact with based on the chest contents. This bug makes doing such a thing pretty much impossible, though.
The hopper change caused this inconsistency, however I think this is WAI because "fixing" it by making comparators able to take output from blocked chests would break a very much wanted behaviour, which an important type of redstone creation relies on (admittedly there is another way to do it at least when the video was made but it is much larger): https://www.youtube.com/watch?v=JIR7Komip5E