Fix for Elementor template conditions not compatible with polylang (you need to save again one of your templates to make it work, after putting this function in your plugin/theme). Needs to be priority 1

polylang-elementor-conditions-compatibility.php

<?php
/**
 * Fix for Elementor template conditions not compatible with Polylang (you need to save again one of your templates to make it work, after putting this function in your plugin/theme)
 * Needs to be priority 1, since Polylang uses the action parse_query which is fired before pre_get_posts
 *
 * @link https://github.com/polylang/polylang/issues/152#issuecomment-320602328
 *
 * @param WP_Query $query
 */
function polylang_elementor_library_conditions_parse_query( $query ) {
	if ( is_admin() && ! empty( $query->query_vars['post_type'] ) && $query->query_vars['post_type'] === 'elementor_library'
	     && ! empty( $query->query_vars['meta_key'] )
	     && $query->query_vars['meta_key'] === '_elementor_conditions' ) {
		$query->set( 'lang', '' );
	}
}
add_action( 'parse_query', 'polylang_elementor_library_conditions_parse_query', 1 );