Redstone lamps turning on/off no longer create a block update. This cripples many redstone circuitry blueprints and designs, especially those that used Redstone B.U.Ds to start a circuit.
The same is true of Brewing stands, which could previously be used as an alternate form of switch for block update detectors.
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Duplicate of MC-5898, please use the search function to see if your bug has already been submitted. Currently over 54% of tickets are being closed as duplicate.