Chains do not appear in the recipe book in survival mode and currently are only attainable theough bastion loot tables.
MCPE-71812
Chains not craftable/ no crafting recipe for chain block in 1.16 beta
Resolved
Duplicate
0
Thank you for your report!
We're actually already tracking this issue at MCPE-69089, so I will resolve and link this ticket as a duplicate.
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