When I have used command blocks to teleport around a large (serveral 1000 block long) map the loading and unloading of chunks has caused repeaters and pressure plates to freeze in a powered state. I have had this happen many times and I have found it highly repeatable.
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Duplicate of MC-711 , please use the search function to see if your bug has already been submitted. Currently over 30% of tickets are being closed as duplicate.