If you put scaffolding above the ground as far out as it can go, then go back one from the end, and place one out, then in the same direction, quickly right click twice, you get a floating scaffolding. If you right click on the top again, you get a new one, and the old one disappears. I was ona multiplayer world and when I did this I got kicked bc 'Flying is not enabled in this server'.
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Thank you for your report!
We're actually already tracking this issue in MC-148795, so I resolved and linked this ticket as a duplicate.
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