Even changing it to "0b" the output doesn't change anything. Filling the chest with the item still leaves the output:
[17:12:59] The block at -11, 14, -58 did not have the required NBT keys
Is there a problem with the id?
Like SteveLovesMining said, id must be "minecraft:nether_star" and not nether_star (quotes+minecraft:)
Count:1b specifies the stack size is one, so if you have for instance two nether stars in the first chest slot, it won't work.
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