If the player silk touches and places a shrieker, and then tried to activate it with a skulk sensor, the shrieker activates the shriek particle but no darkness nor warden spawns. I've attempted leaving and joining the world and the same case happens.
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Thank you for your report!
We're tracking this issue in MCPE-153942, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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it's not a bug it's a feature