When a sticky piston pulls a slimeblock contruction it will delete extended pistons that are in the way of the construction. This does not happen when a slimeblock contraption is pushed into extended pistons by other pistons.
I've attached an example bellow where you can see before and after the lower piston is detracted by removing the lower redstone block.
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is duplicated by 4
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This bug is still existing in the 0.15.0 release. It should have been fixed before it was pushed out.

This bug is still existing in the 0.15.0 release. It should have been fixed before it was pushed out.

Confirmed on Windows 10 0.15.0. Hope this bug gets fixed soon, because it gets in the way a lot when making slimestone contraptions.
It seems to be fixed in 0.15.1 alpha build 1
Please respond and add the current version if you can reproduce this issue.

Please respond and add the current version if you can reproduce this issue.

Cannot reproduce in 0.15.4. (Tested in Windows 10.) It seems to have been fixed, as Nils de Loijer said.
This ticket has been resolved as 'Cannot Reproduce' as it has not been updated recently (1 year+)
This ticket has been resolved as 'Cannot Reproduce' as it has not been updated recently (1 year+)