Two piston.
Check picture for the issue.
It's not quasi-connection issue.
Putting slime block between piston and block is working.
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Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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Pretty sure this is intentional behaviour. According to wiki:
"Sticky pistons stick to a block only when retracting, so a block next to the piston head can be pushed aside by another piston and sticky pistons cannot hold falling blocks horizontally against gravity."