When using the command,
/blockdata ~ ~-1 ~ {TransferCooldown:1200}
then if an item enter this hopper, it's NBT will change to default. It won't delay 1200 ticks.
Comments 2
This bug report was in conflict with MC-109303. For the next snapshot we've made a fix that only respects custom cooldown times if they are larger than the default cooldown time (8 ticks), otherwise it overrides in order to make a predictable hopper timing behavior.
After testing, it seems the
TransferCooldown
tag gets reset when an item goes into the hopper. If an item is in a hopper with theTransferCooldown
tag, it will wait for the cooldown to finish. Gif of the bug.