Some information

Operating system:WIN10
Java version:Build 1.8.0_291-b10
Minecraft version:1.15.2
Baritone version:
Other mods (if used): ImpactClient

Baritone just straight up does not work with concrete powder. As soon as you give it a task that involves placing any quantity of concrete powder, it will instantly tell you "done building" before even placing a single block.

How to reproduce

-Get a schematic containing concrete powder, for example the one I've attached
-make any new world, superflat probably works best
-tell Baritone to build said schematic

Modified settings

None

Final checklist

• I know how to properly use check boxes
• I have included the version of Minecraft I'm running, baritone's version and forge mods (if used).
• I have included logs, exceptions and / or steps to reproduce the issue.
• I have not used any OwO's or UwU's in this issue.

The rest of the blocks (apart from the concrete powder) are being places just fine.
Got the schematic by converting a worldedit .schem to .schematic using this website.
Did not try using the .schem yet, since I thought baritone only used .schematic files

I can easily build concrete using #sel fill but using you schematic does not work so I guess it's more about your schematic/way to obtain the schematic than about the concrete powder.
Does it work without concrete powder or do other blocks cause this as well?
What version/program/mod did you use to create the schematic?
Have you tried using a .schem instead of a .schematic?

Well, the schematic format is the problem.
.schem's are sometimes incorrectly named .schematic as well so don't wonder if you find a ".schem" for 1.13+, but in general you should remember what the author of your schematic converter said in two out of three github issues for his page (PureGero/SchemToSchematic#2 (comment) and PureGero/SchemToSchematic#4 (comment))

Kinda sad I had to read it again before remembering there have already been a few baritone issues mentioning this.