Sidebar menu not showing 4th subcategories

[zygwak]

Hello to you all,

Firstly, I have to admit - I know nothing about PHP coding. That said, I tried to make something work, kinda failed, partly done it, but it's not the way I need it. Let me explain.

I'm working on some basic stuff on a woocommerce website. I changed the category tree of the products and now there are categories nested quite deep. Like - Parent category -> Subcategory -> Nested category -> Further nested category. That last piece wasn't showing on the sidebar, so I digged and found the PHP code responsible for showing categories. Upon finding the "Nested category" code, I simply copy-pasted it in a right place and then added CSS "display:block" rule. Now, the "Further nested category" is showing, when "Nested category" is active. But, here are the problems:

1. If there are multiple categories of that last depth for various "Nested categories", they are all showing;

2. When I click on a link of any "Further nested category", the page redirects correctly and shows all the required products, but the category tree is shrinking to "Parent categories" only.

The store url is: https://skorpion.info.pl/sklep/. The problem #1 can be seen here: https://skorpion.info.pl/kategoria/naczynia-i-przybory/naczynia-kuchenne-naczynia-i-przybory/ - as you can see, both "Garnki" and "Patelnie" nested categories show all of their consecutive further nested subcategories.

The problem number two can be seen here: https://skorpion.info.pl/kategoria/naczynia-i-przybory/naczynia-kuchenne-naczynia-i-przybory/patelnie-naczynia-kuchenne-naczynia-i-przybory/patelnie-aluminiowe/. The categories should remain visible.

Let me post the code below, I'll mark with a comment the block I copy-pasted. I really hope someone can help me here, I would be massively thankful. Cheers!

<aside class="sidebarWrapper">
	<?php
	$types = array(
		'hendi'        => 'Hendi',
		'stalgast'     => 'Stalgast',
		'bartscher'    => 'Bartscher',
		'kromet'       => 'Kromet',
		'hiendkitchen' => 'Hiendkitchen',
	); ?>

	<ul class="parent-list">
		<?php foreach ($types as $type => $value) : ?>
			<li>
				<a href="<?php echo home_url(); ?>/hurtownie/<?php echo $type; ?>"><?php echo $value; ?></a>
			</li>
		<?php endforeach; ?>
	</ul>

	<h2 class="title">
		Kategorie
		<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" id="Layer_1" x="0px" y="0px" viewBox="0 0 492.004 492.004" style="enable-background:new 0 0 492.004 492.004;" xml:space="preserve" width="512px" height="512px">
			<g>
				<g>
					<g>
						<path d="M382.678,226.804L163.73,7.86C158.666,2.792,151.906,0,144.698,0s-13.968,2.792-19.032,7.86l-16.124,16.12 c-10.492,10.504-10.492,27.576,0,38.064L293.398,245.9l-184.06,184.06c-5.064,5.068-7.86,11.824-7.86,19.028 c0,7.212,2.796,13.968,7.86,19.04l16.124,16.116c5.068,5.068,11.824,7.86,19.032,7.86s13.968-2.792,19.032-7.86L382.678,265 c5.076-5.084,7.864-11.872,7.848-19.088C390.542,238.668,387.754,231.884,382.678,226.804z" data-original="#000000" class="active-path" data-old_color="#000000" fill="#F1B63E" />
					</g>
				</g>
			</g>
		</svg>
	</h2>
	<div class="slideDown-wrapper">
		<?php
		$cate = get_queried_object();
		$cateID = $cate->term_id;
		$cateParentID = $cate->parent;
		$mainCateParentObject = get_term($cateParentID);
		$mainCateParentID = $mainCateParentObject->parent;
		$args = array(
			'taxonomy' => 'product_cat',
			'hide_empty' => false,
			'parent'   => 0,
			'orderby' => 'title',
			'order' => 'asc'
		);
		$product_cat = get_terms($args);
		foreach ($product_cat as $parent_product_cat) : ?>
			<ul class="parent-list">
				<li class="<?php if ($parent_product_cat->term_id == $cateID || $parent_product_cat->term_id == $cateParentID || $parent_product_cat->term_id == $mainCateParentID) echo 'active'; ?>">
					<a href="<?php echo get_term_link($parent_product_cat->term_id); ?>">
						<?php echo $parent_product_cat->name; ?>
					</a>
					<?php if ($parent_product_cat->term_id == $cateID || $parent_product_cat->term_id == $cateParentID || $parent_product_cat->term_id == $mainCateParentID) : ?>
						<ul class="child-list">
							<?php
									$child_args = array(
										'taxonomy' => 'product_cat',
										'hide_empty' => false,
										'parent'   => $parent_product_cat->term_id
									);
									$child_product_cats = get_terms($child_args);
									foreach ($child_product_cats as $child_product_cat) : ?>
								<li class="<?php if ($child_product_cat->term_id == $cateID || $child_product_cat->term_id == $cateParentID) echo 'active'; ?>">
									<a href="<?php echo get_term_link($child_product_cat->term_id); ?>">
										<?php if ($child_product_cat->term_id == $cateID) echo '<strong>'; ?>
										<?php echo $child_product_cat->name; ?>
										<?php if ($child_product_cat->term_id == $cateID) echo '</strong>'; ?>
									</a>
									<ul class="child-list">
										<?php
													$child_args = array(
														'taxonomy' => 'product_cat',
														'hide_empty' => false,
														'parent'   => $child_product_cat->term_id
													);
													$child_product_cats = get_terms($child_args);
													foreach ($child_product_cats as $child_product_cat) : ?>
											<li>
												<a href="<?php echo get_term_link($child_product_cat->term_id); ?>">
													<?php if ($child_product_cat->term_id == $cateID) echo '<strong>'; ?>
													<?php echo $child_product_cat->name; ?>
													<?php if ($child_product_cat->term_id == $cateID) echo '</strong>'; ?>
												</a>
                                              		<!-- COPY-PASTED CODE FROM ABOVE-->
                                              		<!-- -->
                                              		<!-- -->
													<ul class="child-list" id="child-4-nest">
													<?php
															$child_args = array(
																'taxonomy' => 'product_cat',
																'hide_empty' => false,
																'parent'   => $child_product_cat->term_id
															);
															$child_product_cats = get_terms($child_args);
															foreach ($child_product_cats as $child_product_cat) : ?>
														<li>
															<a href="<?php echo get_term_link($child_product_cat->term_id); ?>">
																<?php if ($child_product_cat->term_id == $cateID) echo '<strong>'; ?>
																<?php echo $child_product_cat->name; ?>
																<?php if ($child_product_cat->term_id == $cateID) echo '</strong>'; ?>
															</a>
														</li>
													<?php endforeach; ?>
													</ul>
                                              		<!-- END OF COPY-PASTED CODE-->
                                              		<!-- -->
                                              		<!-- -->
											</li>
										<?php endforeach; ?>
									</ul>
								</li>
							<?php endforeach; ?>
						</ul>
					<?php endif; ?>
				</li>
			</ul>
		<?php endforeach; ?>
	</div>
</aside>

<aside class="saleProductsWrapper container p-0">
	<h2 class="title">Promocje</h2>

	<div class="row">
		<?php
		$cate = get_queried_object();
		$cateID = $cate->term_id;
		$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
		$loop = new WP_Query(array(
			'post_type' 	 => 'product',
			'post_status' 	 => 'publish',
			'posts_per_page' => '1',
			'meta_query'     => array(
				array(
					'key'           => '_sale_price',
					'value'         => 0,
					'compare'       => '>',
					'type'          => 'numeric'
				)
			),
			'orderby'   => 'rand'
		));
		while ($loop->have_posts()) : $loop->the_post(); ?>

			<div class="col-lg-12">
				<?php get_template_part('template-parts/product'); ?>
			</div>

		<?php endwhile;
		wp_reset_query(); ?>
	</div>
</aside>