Pistons can receive power from a power source even if it is diagonal, but only while on the vertical axis and downwards. To replicate place a powersource above and diagonally from a piston, then update the piston. The piston will power and stay powered until updated.
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Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-108, which has been marked as Works as Intended - this is an intentional game feature. If you have a different opinion, please visit the Feedback website.
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