Out of memory crash with cleararea and vertical buildrepeat

## Version info
Look i use this weird version i get from leijurv that i then surgically put into impact so i dont know
1.12 Forge with a shit load of other mods but none matter for this report

## How to reproduce
Have buildrepeat on a positive vertical vector
Select an area
Cleararea
(let it clear the area until all above you is void)
Crash

## Modified settings
buildRepeat 0,8,0

## Final checklist
- [x] 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).
- [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.