Meta value Array

If I understand you correctly, I don’t think this is a WordPress issue, just PHP.

When you var_export into the textarea, then submit that via POST, what you then have is not an array but a string. You can check is_string instead of is_array to confirm this.

If you want it to be an array again, you have to explicitly cast it as such:

$actors_array = $_POST['actors_array']; // $actors_array is a string
$actors_array = (array)$actors_array    // $actors_array is now an array

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