Bash Behavior: Using underscores and matching variable names to coerce arrays?

In the code snippet below, I found that, when trying to pass multiple arrays to a function in Bash, I am able to do so using the syntax in my first example, but only if:

1. The array variable names are prefixed with an underscore (_)
2. The array variable names are otherwise identically named in the receiving function as the calling function

function list_arrays {
    local _array_one=$1
    local _array_two=$2
    for ip in "${array_one[@]}"; do
        echo "$ip"
    done
    for node in "${array_two[@]}"; do
        echo "$node"
    done
}

function main {
    local array_one=( 1 2 3 4 5 )
    local array_two=( one two three four five )
    list_arrays "${array_one[@]}" "${array_two[@]}"
}

main

Output:

1
2
3
4
5
one
two
three
four
five

Changing the example slightly to remove the underscores...

#!/bin/bash

function list_arrays {
    local array_one=$1
    local array_two=$2
    for ip in "${array_one[@]}"; do
        echo "$ip"
    done
    for node in "${array_two[@]}"; do
        echo "$node"
    done
}

function main {
    local array_one=( 1 2 3 4 5 )
    local array_two=( one two three four five )
    list_arrays "${array_one[@]}" "${array_two[@]}"
}

main

Output:

1
2

One last iteration to change the name of the array variables in the list_arrays function

#!/bin/bash

function list_arrays {
    local _array_first=$1
    local _array_second=$2
    for ip in "${_array_first[@]}"; do
        echo "$ip"
    done
    for node in "${_array_second[@]}"; do
        echo "$node"
    done
}

function main {
    local array_one=( 1 2 3 4 5 )
    local array_two=( one two three four five )
    list_arrays "${array_one[@]}" "${array_two[@]}"
}

main

Output:

(no output)

The behavior is extremely convenient but I want to understand what I'm doing before I use this in production scripts. At first I thought this might be related to pass-by-reference. However, this syntax works in Bash 4.1 which seems to be before pass-by-reference was added.