Underground hopper (below a water stream without water touching) collects sugarcane, but doesn't deposit it into the chest. It's correctly hooked up into the chest, it just won't move stuff from the hopper inventory into the chest.
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Please attach a screenshot of your setup.

They all hold the items in the hopper and don't pass it on to the chest

Your chest is being blocked by the solid block on top. A solid block ontop of a chest not only blocks you from opening it by right-clicking, but also stops hoppers from filling in items.

@Markus, there is no solid block on top of the hopper or chest, preventing me from opening it, because I CAN open the chests (that's how I checked that there's no items filtering in)

I cannot see properly on the first two pictures, but the chest on your third picture is definitely blocked by the dirt block above it.

I can confirm the same problem plus the opposite happens, as in placing a chest on top of a hopper does absolutely nothing