When /entitydata is used with an entity selector that contains dx, dy and/or dz, it seems to only change the data of one random entity in the specified range.
Example: Running
/entitydata @e[0,11,0,dx=49,dy=0,dz=0] {Item:{id:"minecraft:stone"}}on a row of 50 wood items results in this:
[media](This is the only item that was changed to stone). For the items that weren't changed, it outputs "The data tag did not change: [...] id:"minecraft:stone" [...]", even though they're still displayed and handled as wood items.
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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 delivered.
Please do not mark unreleased versions (anything starting with "Future Version") as affected. You don't know if it will be a problem in the future.