So I found a way to "add" to the fishing loot table without it overriding builtin loot tables For the base fishing loot table, add an entry pointing to a new separate loot table file In future updates, assuming the structure stays the same, the builtin fish/junk/treasure tables will get updated while your addition remains separateTutorialLoot Table Example This tutorial will go through a custom Loot Table file, in order to describe how these files work, and how this file would be used by the game The corresponding loot table as presented on this site is The image (shown on the right) is a visualisation of the file we're going to explainMC "set_nbt" function in loot table does not merge NBT to item
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Minecraft loot table generator 1.15