Try using this function to avoid your problem:
function sld_unregister_taxonomy_from_object_type($taxonomy, $object_type) {
global $wp_taxonomies;
if ( !isset($wp_taxonomies[$taxonomy]) || !get_post_type_object($object_type) ) return false;
foreach (array_keys($wp_taxonomies[$taxonomy]->object_type) as $array_key) {
if ($wp_taxonomies[$taxonomy]->object_type[$array_key] == $array_key) {
unset ($wp_taxonomies[$taxonomy]->object_type[$array_key]);
return true;
}
}
return false;
}
e.x.:
function mwm_unregister_taxonomy(){
sld_unregister_taxonomy_from_object_type( 'post_tag', 'post' );
}
add_action( 'init', 'mwm_unregister_taxonomy');
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