Observer cannot detect the status of items in Item Frame,It should be able to detect and signal Redstone.
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Observers only detect block state changes. Item frames are not blocks, and NBT changes do not trigger observers by design.
This ticket duplicates MC-121022.
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We're tracking this issue in MC-121022, so this ticket is being resolved and linked as a duplicate.
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This is a feature request rather than a bug. Besides you can detect it by comparator.