If you shoot a spectral arrow and hit the ender dragon, you don't get the spectral effect that you normally get when you hit any other mob.
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is duplicated by 13
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I uploaded a couple screenshots. The effect command does work on the Ender Dragon. Not the Wither. Spectral Arrows do not affect either.
Confirmed for:
15w31b also for WitherBoss, probably intended because they both can't have potion effects