Why does my function behave differently with associative and normal arrays?

I have a Bash function that I'm using to delete AWS SSM parameters, but I'm running into a weird issue. When I pass a normal array to the function, it recognizes all three values correctly. However, when I send an associative array, it only recognizes two values. Here's my function:

```bash
#!/usr/bin/env bash

function run_aws_ssm_delete_parameters() {
local -r enable_logging="$1"
local -n parameter_names="$2"
shift 2

local -a aws_cli_flags=(
"delete-parameters"
"--names"
"${parameter_names[@]}"
)

aws_cli_flags+=("$@")

set -x
if result="$(aws ssm "${aws_cli_flags[@]}")"; then
set +x
[[ "${enable_logging}" = true ]] && printf "Good: %sn" "${result}"
return 0
else
set +x
printf "Bad: %s" "$?"
return 1
fi
}

function main() {
local -a normal_array=("one" "two" "three")
run_aws_ssm_delete_parameters true normal_array --color on

local -A associative_array=(
["one"]="value_one"
["two"]="value_two"
["three"]="value_three"
)

run_aws_ssm_delete_parameters true "${!associative_array[@]}" --color on
}

main "$@"
```

When I run this with my normal array, it gives the expected output:
```
++ aws ssm delete-parameters --names one two three --color on

Unable to locate credentials. You can configure credentials by running "aws configure".
+ result=
+ set +x
Bad: 0
```

But when I switch to the associative array, it only returns two values:
```
++ aws ssm delete-parameters --names value_two value_three --color on

Unable to locate credentials. You can configure credentials by running "aws configure".
+ result=
+ set +x
Bad: 0
```

I tried modifying the main function by sending the associative array as a whole instead of expanding it, but I ended up with similar results. How can I ensure I send all the keys from the associative array when calling my function?