This is because you are not passing the parameters in the correct way, taxonomy param needs to be passed under tax_query. Please replace the $args with the below:–
$args = array(
'posts_per_page' => 4,
'tax_query' => array(
array(
'taxonomy' => 'tag',
'field' => 'slug',
'terms' => 'pp'
)
)
);
For more details check the codex
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