"Looping" behavior while building schematic

## Some information
Operating system: `Linux 5.8.13-arch1-1`
Java version:
```
openjdk version "1.8.0_265"
OpenJDK Runtime Environment (build 1.8.0_265-b01)
OpenJDK 64-Bit Server VM (build 25.265-b01, mixed mode)
```

Minecraft version: 1.15.2
Baritone version: v1.5.3
Forge mods (if used): Forge is not installed; using Impact client

## Exception, error or logs
http://ix.io/2DOd

## How to reproduce
Can't really tell more than [using this schematic file](https://www.planetminecraft.com/project/spiral-sphere/)

## Modified settings
```
allowInventory
assumeStep
buildInLayers
simplifyUnloadedYCoord
```

## 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.
- [] I have not used any OwO's or UwU's in this issue.