Custom size tunnels don't place blocks below the tunnel

## Some information
Operating system: windows 10 64bit
Java version: Version 8 Update 241 (build 1.8.0_241-b07)
Minecraft version: 1.15.2
Baritone version: 1.5.2
Forge mods (if used): Impact is installed (not via forge)

## How to reproduce
1. Mine a custom size tunnel without some blocks below it
2. baritone will clear the tunnel space but won't place blocks below the tunnel area unlike the normal `#tunnel` command

## Modified settings
h

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