Remove EntityTypeManger, the only use is for ImageStyleStorage available in the parent class.

src/Plugin/Field/FieldFormatter/BgImgFieldFormatter.php

@@ -5,7 +5,6 @@ namespace Drupal\bg_img_field\Plugin\Field\FieldFormatter;
 use Drupal\Core\Cache\Cache;
 use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Entity\EntityStorageInterface;
-use Drupal\Core\Entity\EntityTypeManagerInterface;
 use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\Core\Field\FieldItemListInterface;
 use Drupal\Core\File\FileUrlGeneratorInterface;
@@ -83,13 +82,6 @@ class BgImgFieldFormatter extends ResponsiveImageFormatter implements ContainerF
    */
   protected $fileUrlGenerator;
 
-  /**
-   * The entityTypeManager service.
-   *
-   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
-   */
-  protected $entityTypeManager;
-
   /**
    * Constructor for the Background Image Formatter.
    *
@@ -128,8 +120,6 @@ class BgImgFieldFormatter extends ResponsiveImageFormatter implements ContainerF
    *   The URL generator for generating URLs for routes.
    * @param \Drupal\Core\File\FileUrlGeneratorInterface $file_url_generator
    *   The file URL generator to generate absolute file URLs.
-   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entityTypeManager
-   *   The entity type manager.
    */
   public function __construct(
     $plugin_id,
@@ -149,7 +139,6 @@ class BgImgFieldFormatter extends ResponsiveImageFormatter implements ContainerF
     RequestStack $request_stack,
     UrlGeneratorInterface $url_generator,
     FileUrlGeneratorInterface $file_url_generator,
-    EntityTypeManagerInterface $entityTypeManager,
   ) {
     parent::__construct(
       $plugin_id,
@@ -165,14 +154,12 @@ class BgImgFieldFormatter extends ResponsiveImageFormatter implements ContainerF
       $current_user
     );
 
-    $this->entityTypeManager = $entityTypeManager;
-    $this->entityTypeManager = $entityTypeManager;
+    $this->breakpointManager = $breakpoint_manager;
     $this->imageFactory = $imageFactory;
     $this->tokenService = $token_service;
     $this->requestStack = $request_stack;
     $this->urlGenerator = $url_generator;
     $this->fileUrlGenerator = $file_url_generator;
-    $this->breakpointManager = $breakpoint_manager;
   }
 
   /**
@@ -197,8 +184,7 @@ class BgImgFieldFormatter extends ResponsiveImageFormatter implements ContainerF
       $container->get('token'),
       $container->get('request_stack'),
       $container->get('url_generator'),
-      $container->get('file_url_generator'),
-      $container->get('entity_type.manager')
+      $container->get('file_url_generator')
     );
   }
 
@@ -395,7 +381,7 @@ class BgImgFieldFormatter extends ResponsiveImageFormatter implements ContainerF
             }
             else {
               // Use image style URL generation instead of ImageFactory->load()
-              $image_style = $this->entityTypeManager->getStorage('image_style')->load($mapping['image_mapping']);
+              $image_style = $this->imageStyleStorage->load($mapping['image_mapping']);
               $url = $image_style->buildUrl($file->getFileUri());
             }