It appears that in the latest snapshot hoppers do not work anymore. They would not accept iron ore from a chest on top and would not place the iron into the furnace below. I also tried to AFK fish and in the morning I saw the hopper didn't collect the items that were caught. the items were in my inventory and some despawned.
MC-144802
Hoppers do not accept or distribute any items.
Resolved
Duplicate
0
Edgar N Jones
(Unassigned)
Unconfirmed
Minecraft 19w08b
Retrieved
Thank you for your report!
However, this issue is a Duplicate of MC-144603.
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