#averagecolor Incomplete result with IndexOutOfBoundsException

Server Implementation

Paper

Server Version

1.21.8

Describe the bug

running the average color pattern with //replace doesn't produce intended result, several chunks are missing (when this happens it appears to be random).

To Reproduce

1. Select a somewhat large, flat area, freshly loaded in (e.g. after running /plot auto)
2. //r #averagecolor[0][255][255][255]
   Sometimes but not always, the command will result in the error and produce an incomplete result.

Corresponding to this is this stacktrace
https://i.rudyops.com/nAVa2/Nowenepi73.txt

It seems like after you fly around a bit, you can //undo the incomplete result and run the same command again and it will work fine. Sometimes it results in the IndexOutOfBoundsException error.

After //undo then running the same command

Expected behaviour

Should produce a uniform result and sometimes does on first try, but not always.

Screenshots / Videos

No response

Error log (if applicable)

https://i.rudyops.com/nAVa2/Nowenepi73.txt

Fawe Debugpaste

https://athion.net/ISPaster/paste/view/4ed1832a877540d5ac01e00416fc3987

Fawe Version

Build 1228

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 //r #averagecolor[0][255][255][255] on a freshly loaded, large flat area, then inspect the linked stacktrace and FAWE debugpaste. Done means the command no longer raises IndexOutOfBoundsException and produces a complete, uniform result on the first run.