I was in a survival in the new snapshot and I was looking for one of the new biomes. I was on the bottom of the nether at the time. I looked up and found the crimson forest. I had scaffolding with me, so I was going to build my way up there.
The problem was, I couldn't place scaffolding on soul sand. I went and checked my controls, and they were fine. I tried looking up the issue and found nothing about it. I went into creative to test it out:
Scaffolding can not be placed on soul sand at any angle.
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Soul sand is not a full block, so it doesn't work.
To place scaffolding blocks down, they need a completely smooth surface at the height of a full block. For example, you can place them not only on full blocks, but also on upside down slabs and upside down trap doors.
Couldron, Hopper and Composter do not work either, although the scaffolding blocks would stand perfectly on the "edge" of these blocks.