Multilingual blog with polylang: query posts in all languages in but only show one version if a post has multiple translations

functions.php

<?php
/*
 * Query all posts versions on home page.
 */
function jba_modify_home_query( $query ) {
	if ( function_exists( 'pll__' ) && ! is_admin() && is_home() ) {
		$query->set('tax_query', '');
		$query->set('lang', '');
	}
}
add_action( 'pre_get_posts', 'jba_modify_home_query' );

home.php

/*
 * Assuming we are using a TwentyNineteen child theme.
 */
<?php if ( have_posts() ) : ?>
		
	<?php while ( have_posts() ) : the_post(); ?>
		
		<?php
		if ( pll_get_post( get_the_ID() ) && get_the_ID() !== pll_get_post( get_the_ID() ) ) {
			// Do not display other languages posts if a translation in the current language exists.
			continue;
		}
		$lang_attribute = '';
		$lang_title = '';
		$lang_slug = pll_get_post_language( get_the_ID(), 'slug' );
		$lang_name = pll_get_post_language( get_the_ID(), 'name' );
		if ( pll_current_language() !== $lang_slug ) {
			$lang_attribute = 'lang="' . $lang_slug . '"';
			$lang_title = '<span aria-label="(' . $lang_name . ')">[' . strtoupper( $lang_slug ) . ']</span> ';
		}
		?>
		<article id="post-<?php the_ID(); ?>" <?php post_class(); echo $lang_attribute; ?>>
			<header class="entry-header">
				<?php the_title( sprintf( '<h2 class="entry-title">'. $lang_title .'<a href="%s" rel="bookmark">', esc_url( get_permalink() ) ), '</a></h2>' ); ?>
			</header><!-- .entry-header -->
			<div class="entry-content excerpt-home">
				<?php the_excerpt(); ?>
			</div><!-- .entry-content -->
			<footer class="entry-footer">
				<?php twentynineteen_entry_footer(); ?>
			</footer><!-- .entry-footer -->
		</article><!-- #post-<?php the_ID(); ?> -->

	<?php endwhile; ?>

	<?php twentynineteen_the_posts_navigation(); ?>

<?php endif; ?>