Whenever a piston pushes an observer into a position, facing another observers face, it ticks at double it`s rate.
Placed without a piston results in normal tick rate.
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Kimani
violine1101
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We're tracking this issue in MC-197705, so this ticket is being resolved and linked as a duplicate.
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migrated
It pulses at double frequency because there are two different updates here: the observer being moved and giving a signal, and the other observer updating due to the moved one. When you place it by hand, it just causes an update to the already existing observer.