How do I replicate Ti Shirase 500-999's garbage blocks?

[Not-A-Normal-Robot]

@MrZ626 pls help i've been trying to do it to no avail

code:
eventsets\test.lua:

return{
    hook_drop=function(P) 
        table.insert(P.field,1,P.field[1])
        table.insert(P.visTime,1,LINE.new(40))
    end
}

modes\test.lua:

return{
    env={
        wait=1,fall=1,
        eventSet="test"
    }
}

how.do.i.make.garbage.mp4

thanks in advance 🥰

[Not-A-Normal-Robot]

Update: I was able to do it by copying each of the values 1 by 1 instead of just transferring it into another variable directly. Seems like it has something to do with pointers