When moving a observer with a sticky piston with a 1 or 2 tick pulse, redstone dust directly on the block where the observer outputs doesn't light up, but can power redstone components.
Also note that the F3 debug menu doesn't show up that the dust is being powered.
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duplicates 1
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Thank you for your report!
We're tracking this issue in MC-151705, so this ticket is being resolved and linked as a duplicate.
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The bug is not critical, but we need to fix it quickly, because it can confuse people