all of my hoppers stopped working and that's causing problems in my big oceanbase.
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Has this world been opened in any version newer than 1.12.2, other than 18w07b? Can you attach the world?

the hopppers are not powered end I've looked with my f3 button if they were enabled and they are! @nope
This world is made in 1.12.2 and now in the new snapshot (18w07b) all of my hoppers doesn't do anything! @redstonehelper

Please attach the world.

how could I ever upload a world if the maximum size limit is 10mb? my world is maybe 500mb XD

You can upload it somewhere else and link it here. Note that we are interested in the world before it was opened in 1.12.2, if possible.

https://www.minecraftworldmap.com/worlds/c06Xu
this is my world, ocean base can be found at the coördinates : -2280 99 3275

Great find, thanks!
Cannot reproduce.
Are your hoppers powered? They lock when powered with redstone.