1. chargers2417 Builder
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    Minecraft Username: chargers2417

    Brief Description: Colored signs have discoloration when facing either North or South.

    Instructions: Place any colored sign that faces North or South and the color will be darker. Signs facing East and West work just fine.

    How many times did you recreate this bug?: Many times

    Result: Sign on the right

    Expected Result: Sign on left

    Evidence:
     
  2. BrokeMel broke
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    Pretty sure this is a vanilla lighting bug. Try reporting it to Mojang?
     
  3. 314 Irrational SuperMod, former ServerAdmin
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    Confirmed it in Spigot 1.9 and Vanilla 1.9 a few weeks ago. It appears to be a vanilla one - especially because I remember this bug in a 1.8 vanilla world from 2015.
     
  4. JamieSinn Retired Lead Administrator/Developer
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    Lighting issue as 314 said, oh, also, arrows are glow in the dark apparently.
    Weird 1.9