Hey,
I was testing out the new snapshot, and when I went to place scaffolding, it started turning to stone blocks starting at the bottom and working its way up. If you place it fast enough the top block wont turn to stone, and you can then break the stone underneath and the final piece of scaffolding will float.
Thanks, Hero
Environment
Windows 10
Model of computer: Acer Aspire E15
I believe I have java 64 bit.
No mods, just the latest snapshot profile.
Tested at 11:50 11/21/18.
I have a similar issue, blocks suddenly appear in my world