The hopper cannot detect the other half of the chest and puts in items that could stack into different slots.
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Comments 3
Is this one issue or two issues?
Hoppers having problem with sorting into a chest
vs.
Hoppers pulling from a double chest only pull from its associated half, and not from the first slot.
This appears to be a new occurrence in 1.13-pre3 (I never noticed it in pre2). Hoppers pulling from a double chest only pull from its associated half, and not from the first slot.