I have been playing Minecraft for a year and love it. I found this annoying bug where lead's become invisible sometimes. The reason why I wrote "Windows 7/8" is because I use Windows 7 and my little sister uses Windows * and it happens on both computers.
It is impossible to trigger the bug, as it just happens sometimes.
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I found this bug on Windows 7 too! Very annoying!
Duplicate of MC-14826, please use the search function to see if your bug has already been submitted. Currently over 57% of tickets are being resolved as duplicate.