Instantiation of convex polyhedral region seems to not work sometimes

Server Implementation

Paper

Server Version

1.20.5/6

Describe the bug

I'm not sure what's causing said bug, but as stated in the title, sometimes when instantiating a convex polyhedral region, and then using said region in an EditSession or something (I used EditSession#setBlocks), the blocks aren't properly modified. This is because the region, while it has all its vertices, doesnt have all the blocks that it should have - see this (me discussing the issue on Discord) for more info.

To Reproduce

1. Try to instantiate 2 convex polyhedral regions back to back.

Expected behaviour

It should populate the region with all the blocks, instead of just the vertices.

Screenshots / Videos

I know this doesn't show much, nor is it easy to see really, but this is the same screenshot I put in the Discord when discussing it. Check the link above that goes to the Discord for more context here.

Error log (if applicable)

No response

Fawe Debugpaste

https://athion.net/ISPaster/paste/view/58227cfeef4043b6a7d26f1dd759d9b2

Fawe Version

FastAsyncWorldEdit version 2.10.1-SNAPSHOT-778;c77d341

Checklist

• I have included a Fawe debugpaste.
• I am using the newest build from https://ci.athion.net/job/FastAsyncWorldEdit/ and the issue still persists.

Anything else?

No response

Start by reproducing the reported case on Paper 1.20.5/6 with two convex polyhedral regions instantiated back to back, then used with EditSession#setBlocks. Use the linked FAWE debugpaste and Discord discussion for context; done means the region contains all expected blocks rather than only its vertices.