wpgraphql-ignore-keys-in-cache-headers.php

add_filter( 'graphql_query_analyzer_graphql_keys', function( $graphql_keys, $return_keys, $skipped_keys, $return_keys_array, $skipped_keys_array ) {

	$keys_array = explode( ' ', $return_keys );

	if ( empty( $keys_array ) || ! in_array( 'operation:GetPostBySlug', $keys_array, true )  ) {
		return $graphql_keys;
	}

	if ( ( $key = array_search('list:tag', $keys_array ) ) !== false ) {
		unset( $keys_array[$key] );
	}

	if ( ( $key = array_search('list:category', $keys_array ) ) !== false) {
		unset( $keys_array[$key] );
	}

	$graphql_keys['keys'] = implode( ' ', $keys_array );
	
	return $graphql_keys;

}, 10, 5 );