When you put the structure of the channel, particles are formed, but when you remove a central block from the sides of the structure, the channel is deactivated but the particles continue to appear and also the block is turned slightly as if it were a head that is placed in the direction of your position.
Works as intended: The interaction between prismarine and the conduit creating particles is supposed to be similar to the particle interaction between bookshelves and the enchantment table (only these connections aren't vertical unlike the conduit).