When you have a piston head disappeared (MC-6781), the retracting piston base deletes any block in front of it, even bedrock.
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Also, this is a bug related to MC-6781, which is the bug that makes this possible.
Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases. If this has been done, we can reopen the issue.
Keep in mind that the "Resolved"-Status on this ticket just means "Answered", and that we are waiting for further information on whether this issue still exists or not. We will reopen it as soon as the requested information has been deliviered.
Please attach screenshots.