I tested BUD on PC and it worked.However,there is no BUD in Pocket Edtion redstone electricities.
MCPE-42041
I haven't found block update detector in Minecraft Pocket Edition(offical)
Resolved
Duplicate
0
Thank you for your report!
However, this issue is a Duplicate of MCPE-14664.
If you have additional information, please add it to that report.
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