When I put a hopper below a brewing stand, a hopper above with nether wart and one beside with water bottles, the water bottles and nether wart are loaded correctly, brewing starts, but the bottles are pulled out by the bottom hopper almost instantly so they do not become potions.
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Just downloaded a copy locally, it behaves the same. I attached a picture of the setup, with no hopper below it works fine (except I have to manually unload the potions), but as soon as I place a hopper below the brewing stand it unloads the water bottles immediately. It does not matter whether the hopper below points at the barrel or not.
This isn't a bug, this is just how hoppers under brewing stands work. The game really doesn't have a way of knowing which kind of potion you would intend to be your final product. You might even want a plain water bottle to pass through if you were using the brewing stand with a hopper to sort bottles rather than to brew.
You can prevent the hopper from taking out the bottles too early by locking it with redstone power. That can be a simple as a lever next to the hopper, or it can be a timing circuit that is sensitive to the number of ingredient items you put in. There are many designs for automatic brewing machines if you ask around the player community or search online.
This is a parity bug.
In Java Minecraft, if the brewing stand is actively brewing portions, the portions will not be taken away from the brewing stand. This allows for easy automatic brewing, because you only need to check whether there are still ingredients waiting to be added, and if so disable the hopper.
In MCPE, this doesn't work. If you enable the hopper when the last input ingredient falls into the brewing stand, the bottles just started the last brewing will be taken away, leaving the last ingredient in the brewing stand and causing the whole setup to fail. You'll have to add a 22 seconds resettable signal extender to prevent it. Which is a big circuit.
Does this only happen on a realm or does the same issue occur on a local copy of the world?
You might also attach screenshots of the setup.
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