[Pas2js] 2d array bug?

[nick's hardware]

using Pas2JS Compiler version 2.0.6 [2021/04/15] for Win32 i386

Program test;
  uses browserconsole;

type
  ta = array[0..1,0..1] of integer;
var
  a1 : ta;
  a2 : ta;
begin
  a1[0,0]:=10;
  a1[0,1]:=10;

//make a copy of array
  a2:=a1;

//modify the copy
  a2[0,0]:=99;
  a2[0,1]:=99;

//print contents of original array - it should print 10 10 - but it prints 99 99
//this works normally with single dimension array. have not tested
with three dimensional
  writeln(a1[0,0]);
  writeln(a1[0,1]);
 end.