It is related to MC-6785
When you activate a dispenser, any hopper attached is stopped.
In MC-6785 it is stated that if you want it to work (ie dispenser firing while hopper filling it), you'll have just to power the dispenser through a block which doesn't work (second screenshot)
What I expected to happen was...:
Having the dispenser firing anything I put inside teh connected hopper
What actually happened was...:
The hopper stopped as soon as the dispenser is powered
Steps to Reproduce:
1. put a dispenser and a dropper attached to it
2. power the dispenser (any ways)
3. try to put things inside the hopper and see that they are not grabbed by the dispenser as soon as the dipsenser is powered
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From the Minecraft Wiki: "Each time the block receives power from a redstone circuit, a random item from its inventory drops out." Just put the dispenser on a clock and it will shoot out all items you put in it.
Do really I have to open a new one with a comparator ? for you to take this into account ? (comparator=clock)
I fou have read a bit my comment and what I say, you might have seen that the problem is not (I power badly the dispenser) but more that the blocked hopper is annoying.
Yes as stated in MC-6785 and in your second image powering any adjacent block causes the dispenser to shoot out. So the clock needs to be connected to that block to avoid interference to the hopper.
If you mean that a comparator is constantly causes the dispenser to shoot out? That's fixed for the next snapshot anyway, see MC-6077.
To make it fire it continuously, you can put a comparator but it doesn't change anything : the hopper is stopped.
If someone has a solution, don't hesitate
Regards