Conditional delete metadata does not works

I would like to remove some metadata if I save post with another metadata with custom post type in my plugin.. I tried to use init hook and iterate array from get_posts function but it doesn’t work and too I tried with save_post hook but it doesn’t work too..

Attaching action in my __construct function (in class with plugin functions):

add_action('save_post_survey', [$this, 'survey_start_type_validation']);

And here I trying to check if metadata exists and if yes, then delete the old:

function survey_start_type_validation($post_id)
    {
            $type_of_running = get_post_meta($post_id, 'spusteni_dotazovani');

            if($type_of_running == 'manually_run') {
                if(metadata_exists($post_id, 'datum_a_cas_planovaneho_spusteni')) {
                    delete_post_meta($post_id, 'datum_a_cas_planovaneho_spusteni');
                }
            } elseif($type_of_running == 'planned_run') {
                if(metadata_exists($post_id, 'running_status')) {
                    delete_post_meta($post_id, 'running_status');
                }
            }

    }

I can’t figure out what’s wrong with my code.. Can anyone advice me?