Note that the nbt keys id, x, y, z, ForgeData, ForgeCaps and the registry name of the block entity type (for me that's mob_slayer) are reserved for the default data Minecraft has to store about your block entity. Do not try to use them.
Note that the nbt keys id, x, y, z, ForgeData, ForgeCaps and the registry name of the block entity type (for me that's mob_slayer) are reserved for the default data Minecraft has to store about your block entity. Do not try to use them.