I tested this over and over again and could not get the Warden to spawn after I place a Shrieker down. When I find a Shrieker that is naturally generated it summons the Warden and gives the darkness effect. If I pick up that Shrieker with silk touch and place it down again the Warden will no longer spawn.
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We're tracking this issue in MCPE-153942, so this ticket is being resolved and linked as a duplicate.
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That's intentional so the warden cannot grief your base by killing you over and over again, your pets or beloved animals or the villagers that you have