Testing how WordPress handles the parsing of URL params in RTL languages

rtl-testing.php

<?php
/**
 * Plugin Name:     RTL Testing
 * Plugin URI:      https://wzymedia.com
 * Description:     Testing an issue with RTL languages and URL params.
 * Author:          w33zy
 * Author URI:      https://wzymedia.com
 * Text Domain:     rtl-testing
 * Domain Path:     /languages
 * Version:         0.1.0
 *
 * @package         RTL_Testing
 */

class RTL_Testing {

	public static function start() {

		static $started = false;

		if ( ! $started ) {

			self::add_filters();
			self::add_actions();

			$started = true;
		}
	}

	public static function add_filters() {

	}

	public static function add_actions() {

		add_action( 'init', array( __CLASS__, 'custom_taxonomy' ), 10 );
	}

	public static function custom_taxonomy() {
			// 'הוצאה לאור'
			$plural   = 'הוצאה'; // Expenditure
			$single   = 'הוצאה'; // Expenditure
			$tax_name = 'rtl_' . $single;
			$slug = strtolower( $single );

			$opts['hierarchical']      = true;
			$opts['public']            = true;
			$opts['query_var']         = $tax_name;
			$opts['show_admin_column'] = true;
			$opts['show_in_nav_menus'] = true;
			$opts['show_tag_cloud']    = true;
			$opts['show_ui']           = true;
			$opts['sort']              = '';
			$opts['capabilities']['assign_terms'] = 'edit_posts';
			$opts['capabilities']['delete_terms'] = 'manage_categories';
			$opts['capabilities']['edit_terms']   = 'manage_categories';
			$opts['capabilities']['manage_terms'] = 'manage_categories';
			$opts['labels']['add_new_item']               = esc_html__( "Add New {$single}", 'rtl-testing' );
			$opts['labels']['add_or_remove_items']        = esc_html__( "Add or remove {$plural}", 'rtl-testing' );
			$opts['labels']['all_items']                  = esc_html__( $plural, 'rtl-testing' );
			$opts['labels']['choose_from_most_used']      = esc_html__( "Choose from most used {$plural}", 'rtl-testing' );
			$opts['labels']['edit_item']                  = esc_html__( "Edit {$single}", 'rtl-testing' );
			$opts['labels']['menu_name']                  = esc_html__( $plural, 'rtl-testing' );
			$opts['labels']['name']                       = esc_html__( $plural, 'rtl-testing' );
			$opts['labels']['new_item_name']              = esc_html__( "New {$single} Name", 'rtl-testing' );
			$opts['labels']['not_found']                  = esc_html__( "No {$plural} Found", 'rtl-testing' );
			$opts['labels']['parent_item']                = esc_html__( "Parent {$single}", 'rtl-testing' );
			$opts['labels']['parent_item_colon']          = esc_html__( "Parent {$single}:", 'rtl-testing' );
			$opts['labels']['popular_items']              = esc_html__( "Popular {$plural}", 'rtl-testing' );
			$opts['labels']['search_items']               = esc_html__( "Search {$plural}", 'rtl-testing' );
			$opts['labels']['separate_items_with_commas'] = esc_html__( "Separate {$plural} with commas", 'rtl-testing' );
			$opts['labels']['singular_name']              = esc_html__( $single, 'rtl-testing' );
			$opts['labels']['update_item']                = esc_html__( "Update {$single}", 'rtl-testing' );
			$opts['labels']['view_item']                  = esc_html__( "View {$single}", 'rtl-testing' );

			$opts['rewrite']['ep_mask']         = EP_NONE;
			$opts['rewrite']['hierarchical']    = false;
			$opts['rewrite']['slug']            = $slug;
			$opts['rewrite']['with_front']      = false;

			register_taxonomy( $tax_name, array( 'post' ), $opts );

			flush_rewrite_rules( false );
	}

}

RTL_Testing::start();