Baritone says filling operation is done even though it isnt

## Some information
Operating system: Fedora 31 (Workstation Edition) (Kernel: 5.6.7-200.fc31.x86_64)
Java version: OpenJDK 64-Bit Server VM (build 25.242-b08, mixed mode)
Minecraft version: 1.15.2
Baritone version: 1.5.3
Forge mods (if used):
I'm using impact.

## Exception, error or logs
[latest.log](https://github.com/cabaletta/baritone/files/4564484/latest.log)

## How to reproduce
Expected: The area should be filled.
What I did:
- Clear all selections.
- Select an area.
- Shift it down by 1.
- Fill area with smooth_stone.
What actually happened: Baritone says the area is filled, even though its not.

## Modified settings
Same as in https://github.com/cabaletta/baritone/issues/1646

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