Comparator doesnt update behind block when the detectorrail is removed by piston, look at pics
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Confirmed.
It dosen't have to be on a rail. Correct me if I'm looking at the pictures wrong.

Based on MC-6344, I'd say this is a non-issue.

Is this still a concern in the current Minecraft version 1.8.1 Prerelease 3 / Launcher version 1.5.3 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
No response for over a year.

Reopening... confirmed to affect 1.11.2 & 17w06a. EDIT: Also taking ownership of the ticket since the original owner hasn't updated it in a year.
Merged into MC-120986.
lol, still figuring out droppers, hoppers, and redstone comparators. care to explain "redstone logic?"