test.sh:

#!/bin/bash

print_value() {
    local -a foo=("${var[@]}");
    echo -n "$foo" | xxd -p
}

var=($'\x01\x01\x01\x01\x01\x01');
print_value

Expected output: 010101010101

Actual output: 010101

$ bash --version
GNU bash, version 5.1.8(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2020 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.