An icon before the title (page-list-ext-title)

I have installed a plugin for wordpress: ACF
with this plugin I have made a new field for the pages called: category_icon

I have uploaded the image to the content.

I want to display this image (icon) before the title on the frontpage.
so I have added a few codes in page-list.php:

if ( $show_title == 1 ) {
							$icoontje = get_field('category_icon');
							$list_pages_html .= '<img src="'.$icoontje.'" /><h3 class="page-list-ext-title"><a href="'.$link.'" title="'.esc_attr($page->post_title).'">'.$page->post_title.'</a></h3>';
							
						}

but it doesn’t show the image, I do something wrong here?