Under a specific structure, the piston will be affected by the surrounding blocks, resulting in expansion and contraction
[media]Under the structure in the picture，Change the block around the piston
piston will be change
For example, I placed a button,the piston is up
[media]I broke the button and the piston came up
[media]
Thank you for your report!
We're tracking this issue in MC-108, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
If you would like to learn more about this particular feature, see this article on the Minecraft Wiki.
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