MCPE-8500Trapdoor opens when the block next to one gets modified.
Trapdoors open when the block next to them gets broken, placed, replaced or modified.
But you can use this bug to create a Trappdoor Game!
(See second attachment!)
Linked Issues
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Added duplicates link: MCPE-2884Trapdoors open/close when a block near them is updatedFixed
Resolution: Unresolved → Duplicate
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This issue was reported previously as
MCPE-2884; comment your experience there!