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use strict;
use warnings;
...
   $arr[0]->[0] = "xyz"; $arr[0]->[1] = "123";
   for my $e (@arr) { print "Case 2 after: $e: $e->[0] $e->[1]\n" }
}

Case 1 before: ARRAY(0x61ddc8): abc def
Case 1 before: ARRAY(0x61ddc8): abc def
...
Case 2 after: ARRAY(0x61de28): xyz 123
Case 2 after: ARRAY(0x315918): abc def
Case 2 after: ARRAY(0x315990): abc def

my @arr = ( [@list] ) x $nelts;

my @arr = map { [@list] } 1 .. $nelts;