Other than the fact skulk shriekers are obtainable with silk touch, when they're placed back down in the same spot continuously shriek. I'm not sure if this is intended or not, but I think if in the deep dark biome it should summon a warden or cease shrieking.
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I realized this is a feature, but I think it should only shriek every few minecraft days when activated. Another option is to only shriek when activated by a redstone signal.
i can confirm this