Basically; when you remove a block (with redstone torches) attached to the side(s) of it. The torches will remain however the block will not. Thus leaving the torch(es) floating.
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I did, search. I no doubt searched terribly in which I am sorry.
35th duplicate of MC-5711 , please use the search function to see if your bug has already been submitted. Currently over 35% of tickets are being closed as duplicate.