running fill command causes ghost blocks in latest build

Server Implementation

Paper

Server Version

1.20.4

Describe the bug

i use a prison core that can trigger different enchants and one of them is a fill command to replace the blocks on the layer of the player with air and sell the blocks for a value, this has always worked until recent build as where now it causes 1-2 ghost blocks to remain.

To Reproduce

run this command, it is random sometimes it gets rid of all blocks sometimes it doesnt.

fill selection 100%AIR %global.blockworld%
%worldguard.region-minx%, %global.blocky%, %worldguard.region-minz%
%worldguard.region-maxx%, %global.blocky%, %worldguard.region-maxz%

Expected behaviour

it should remove all blocks and set them to air, it does this but seems to leave a ghost block

Screenshots / Videos

No response

Error log (if applicable)

No response

Fawe Debugpaste

https://athion.net/ISPaster/paste/view/33f1fbfab6cc4eab90cddf2082f2979b

Fawe Version

2.13.1-SNAPSHOT-1061;46dc455

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 supplied fill command on Paper 1.20.4 with FAWE 2.13.1-SNAPSHOT-1061 and review the linked FAWE debugpaste. Trace the fill operation and its block updates to determine why blocks sometimes remain visible. Done means the selected layer consistently becomes air without ghost blocks.