The scaffolding acts really weird and the blocks disappear in and out when you go to build out horizontally with the block at the world height.
I have attached a video which demonstrates the bug.
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NeunEinser
Thank you for your report!
We're already tracking this issue at MC-143167, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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