Alpha-14

Using "Wall," clicking to lock it in place, then using "Wall" again in the same spot, to raise the layer below it, causes the original dirt from the first Wall to regenerate. The raised portion which was locked appears unaffected, but disappears when left-clicked.

Edit: update due to new symptoms appearing

Edit: Further testing..

Right-clicking a single time, which is supposed to lock the blocks in the raised position, nearly always bugs. The blocks "appear" to be in the raised position, but are not. Left clicking nearly always removes then, simply vanishing. Likewise, clicking on the hollowed spot below nearly always reforms as the moved block.

Right-clicking a 2nd time, seems to actually perform the intended function. The blocks become "actually" there, able to be left-clicked or mined per normal.

Additional issue of raising a Wall while other blocks are above the intended space. The wall raises through the blocks. If right-clicked to lock it, the raised blocks simply overwrite the existing blocks. (Tested with Spruce Wood and Spruce Logs)

Edit: Also, I just wanted to say how much I hated earlier version of Wall. But the current one, even with its bugs, is so awesome. The ability to lock walls into the raised position creates so much versatility. And I just found out that (with early ranks, at least) you can launch yourself while moving! Not sure if the latter is intended, but its so canonical.

Is this still a current issue?

This sounds like a pain in the ass