Seems like you have a missing array in tax_query
instead of
'tax_query' => array(
'taxonomy' => 'st_tour_type'
),
should be
'tax_query' => array(
array (
'taxonomy' => 'st_tour_type',
'operator' => 'EXISTS'
)
),
When using tax query without terms/fields we must include the “operator” property.
You can check WP_Query taxonomy for more information on working with taxonomies.
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