Unlike foreach loops, while does not localize $_. In your code, $_ must be an alias to $g::TaskList[0], like $array[0] is in the following code:

@array = ('a');
foreach (@array) {
   # $_ is an alias for $array[0].
   while (<DATA>) { }
   # $_ and $array[0] are clobbered
   print("[$_]$/");      # Prints "[]"
}
print("[$array[0]]$/");  # Prints "[]"
[download]

The fix is to localize $_:

@array = ('a');
foreach (@array) {
   # $_ is an alias for $array[0].
   local $_ = $_;  # This $_ is not an alias for $array[0].
   while (<DATA>) { }
   # $_ is clobbered, but not $array[0]
   print("[$_]$/");      # Prints "[]"
}
print("[$array[0]]$/");  # Prints "[a]"
[download]

If you want to preserve $_ within the loop, use:

@array = ('a');
foreach (@array) {
   # $_ is an alias for $array[0].
   {
      local $_;  # This $_ is not an alias for $array[0].
      while (<DATA>) { }
   }
   # Neither $_ nor $array[0] are clobbered
   print("[$_]$/");      # Prints "[a]"
}
print("[$array[0]]$/");  # Prints "[a]"
[download]

or:

@array = ('a');
foreach (@array) {
   # $_ is an alias for $array[0];
   while (my $line = <DATA>) { }
   # Neither $_ nor $array[0] are clobbered
   print("[$_]$/");      # Prints "[a]"
}
print("[$array[0]]$/");  # Prints "[a]"
[download]

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