overriding-connection-resolver.php

add_filter( 'graphql_pre_resolve_field', function( $default, $source, $args, $context, $info, $type_name, $field_key, $field, $field_resolver ) {

	// if the field is not the 'tags' field, and the
	if ( ! ( 'tags' === $field_key  && 'post' === strtolower( $type_name ) ) ) {
		return $default;
	}

	$empty = [
		'edges' => [],
		'nodes' => [],
	];

	if ( $source instanceof \WPGraphQL\Model\Post && 'revision' === $source->post_type ) {

		$terms = wp_get_object_terms( $source->databaseId, 'post_tag' );
		if ( empty( $terms ) ) {
			return $empty;
		}
		$term_ids = wp_list_pluck( $terms, 'term_id' );
		$resolver = new \WPGraphQL\Data\Connection\TermObjectConnectionResolver( $source, $args, $context, $info );
		$resolver->set_query_arg( 'include', $term_ids );
		return $resolver->get_connection();
	}

	return $empty;

}, 10, 9 );