To reproduce, replace a vine (the vine must have no block behind it) with a carpet in a way that would result in a floating, unsupported carpet. A carpet item will drop, but the block carpet will still appear to be there. This carpet acts particularly strangely, inheriting properties from the block east of it, and entities will pass straight through it.
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Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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Confirmed in Win10 too. The new block is a ghost block.