Meta Query returning empty array

As /u/Nicolai suggested in the question comment section, it’s always a good idea to add in post_status not only for validity but for speed purposes too. It could look like this:

$practice_args = array(
    'post_type'     => 'sf-location',
    'post_status'   => 'publish',
    'meta_query'    => array(
        array(
            'key'   => 'practice_id',
            'value' => $current_practice_id,
        ),
    ),
);

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