diff --git a/app/Api/ListingResponseBuilder.php b/app/Api/ListingResponseBuilder.php
index 39752e6d4..44117bad9 100644
--- a/app/Api/ListingResponseBuilder.php
+++ b/app/Api/ListingResponseBuilder.php
@@ -4,21 +4,29 @@ namespace BookStack\Api;
 
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Database\Eloquent\Collection;
+use Illuminate\Database\Eloquent\Model;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
 
 class ListingResponseBuilder
 {
-    protected $query;
-    protected $request;
-    protected $fields;
+    protected Builder $query;
+    protected Request $request;
+
+    /**
+     * @var string[]
+     */
+    protected array $fields;
 
     /**
      * @var array<callable>
      */
-    protected $resultModifiers = [];
+    protected array $resultModifiers = [];
 
-    protected $filterOperators = [
+    /**
+     * @var array<string, string>
+     */
+    protected array $filterOperators = [
         'eq'   => '=',
         'ne'   => '!=',
         'gt'   => '>',
@@ -62,9 +70,9 @@ class ListingResponseBuilder
     /**
      * Add a callback to modify each element of the results.
      *
-     * @param (callable(Model)) $modifier
+     * @param (callable(Model): void) $modifier
      */
-    public function modifyResults($modifier): void
+    public function modifyResults(callable $modifier): void
     {
         $this->resultModifiers[] = $modifier;
     }
diff --git a/app/Auth/Permissions/JointPermissionBuilder.php b/app/Auth/Permissions/JointPermissionBuilder.php
index 129b4a04d..114cff619 100644
--- a/app/Auth/Permissions/JointPermissionBuilder.php
+++ b/app/Auth/Permissions/JointPermissionBuilder.php
@@ -22,7 +22,7 @@ class JointPermissionBuilder
     /**
      * @var array<string, array<int, SimpleEntityData>>
      */
-    protected $entityCache;
+    protected array $entityCache;
 
     /**
      * Re-generate all entity permission from scratch.
@@ -230,7 +230,7 @@ class JointPermissionBuilder
     /**
      * Create & Save entity jointPermissions for many entities and roles.
      *
-     * @param Entity[] $entities
+     * @param Entity[] $originalEntities
      * @param Role[]   $roles
      */
     protected function createManyJointPermissions(array $originalEntities, array $roles)
diff --git a/app/Entities/Models/Page.php b/app/Entities/Models/Page.php
index 7a60b3ada..a224071cc 100644
--- a/app/Entities/Models/Page.php
+++ b/app/Entities/Models/Page.php
@@ -88,8 +88,6 @@ class Page extends BookChild
 
     /**
      * Get the current revision for the page if existing.
-     *
-     * @return PageRevision|null
      */
     public function currentRevision(): HasOne
     {
diff --git a/app/Entities/Repos/BaseRepo.php b/app/Entities/Repos/BaseRepo.php
index da939e102..815c0bb2e 100644
--- a/app/Entities/Repos/BaseRepo.php
+++ b/app/Entities/Repos/BaseRepo.php
@@ -87,14 +87,14 @@ class BaseRepo
     {
         if ($coverImage) {
             $imageType = $entity->coverImageTypeKey();
-            $this->imageRepo->destroyImage($entity->cover);
+            $this->imageRepo->destroyImage($entity->cover()->first());
             $image = $this->imageRepo->saveNew($coverImage, $imageType, $entity->id, 512, 512, true);
             $entity->cover()->associate($image);
             $entity->save();
         }
 
         if ($removeImage) {
-            $this->imageRepo->destroyImage($entity->cover);
+            $this->imageRepo->destroyImage($entity->cover()->first());
             $entity->image_id = 0;
             $entity->save();
         }
diff --git a/app/Entities/Tools/BookContents.php b/app/Entities/Tools/BookContents.php
index 0ad424de2..f45bdfcc1 100644
--- a/app/Entities/Tools/BookContents.php
+++ b/app/Entities/Tools/BookContents.php
@@ -181,7 +181,7 @@ class BookContents
             $model->changeBook($newBook->id);
         }
 
-        if ($chapterChanged) {
+        if ($model instanceof Page && $chapterChanged) {
             $model->chapter_id = $newChapter->id ?? 0;
         }
 
@@ -235,7 +235,7 @@ class BookContents
             }
 
             $hasPageEditPermission = userCan('page-update', $model);
-            $newParentInRightLocation = ($newParent instanceof Book || $newParent->book_id === $newBook->id);
+            $newParentInRightLocation = ($newParent instanceof Book || ($newParent instanceof Chapter && $newParent->book_id === $newBook->id));
             $newParentPermission = ($newParent instanceof Chapter) ? 'chapter-update' : 'book-update';
             $hasNewParentPermission = userCan($newParentPermission, $newParent);
 
diff --git a/app/Entities/Tools/Cloner.php b/app/Entities/Tools/Cloner.php
index 52a8f4cf0..5594c33a6 100644
--- a/app/Entities/Tools/Cloner.php
+++ b/app/Entities/Tools/Cloner.php
@@ -7,6 +7,7 @@ use BookStack\Entities\Models\Book;
 use BookStack\Entities\Models\Bookshelf;
 use BookStack\Entities\Models\Chapter;
 use BookStack\Entities\Models\Entity;
+use BookStack\Entities\Models\HasCoverImage;
 use BookStack\Entities\Models\Page;
 use BookStack\Entities\Repos\BookRepo;
 use BookStack\Entities\Repos\ChapterRepo;
@@ -109,9 +110,11 @@ class Cloner
         $inputData['tags'] = $this->entityTagsToInputArray($entity);
 
         // Add a cover to the data if existing on the original entity
-        if ($entity->cover instanceof Image) {
-            $uploadedFile = $this->imageToUploadedFile($entity->cover);
-            $inputData['image'] = $uploadedFile;
+        if ($entity instanceof HasCoverImage) {
+            $cover = $entity->cover()->first();
+            if ($cover) {
+                $inputData['image'] = $this->imageToUploadedFile($cover);
+            }
         }
 
         return $inputData;
diff --git a/app/Http/Controllers/PageRevisionController.php b/app/Http/Controllers/PageRevisionController.php
index 89775a602..85ee6c2bc 100644
--- a/app/Http/Controllers/PageRevisionController.php
+++ b/app/Http/Controllers/PageRevisionController.php
@@ -3,6 +3,7 @@
 namespace BookStack\Http\Controllers;
 
 use BookStack\Actions\ActivityType;
+use BookStack\Entities\Models\PageRevision;
 use BookStack\Entities\Repos\PageRepo;
 use BookStack\Entities\Tools\PageContent;
 use BookStack\Exceptions\NotFoundException;
@@ -50,6 +51,7 @@ class PageRevisionController extends Controller
     public function show(string $bookSlug, string $pageSlug, int $revisionId)
     {
         $page = $this->pageRepo->getBySlug($bookSlug, $pageSlug);
+        /** @var ?PageRevision $revision */
         $revision = $page->revisions()->where('id', '=', $revisionId)->first();
         if ($revision === null) {
             throw new NotFoundException();
@@ -78,6 +80,7 @@ class PageRevisionController extends Controller
     public function changes(string $bookSlug, string $pageSlug, int $revisionId)
     {
         $page = $this->pageRepo->getBySlug($bookSlug, $pageSlug);
+        /** @var ?PageRevision $revision */
         $revision = $page->revisions()->where('id', '=', $revisionId)->first();
         if ($revision === null) {
             throw new NotFoundException();
diff --git a/app/Providers/RouteServiceProvider.php b/app/Providers/RouteServiceProvider.php
index ac3307f2d..415ec6626 100644
--- a/app/Providers/RouteServiceProvider.php
+++ b/app/Providers/RouteServiceProvider.php
@@ -19,14 +19,6 @@ class RouteServiceProvider extends ServiceProvider
      */
     public const HOME = '/';
 
-    /**
-     * This namespace is applied to the controller routes in your routes file.
-     *
-     * In addition, it is set as the URL generator's root namespace.
-     *
-     * @var string
-     */
-
     /**
      * Define your route model bindings, pattern filters, etc.
      *
diff --git a/app/Search/SearchRunner.php b/app/Search/SearchRunner.php
index cc44e6125..013f7b380 100644
--- a/app/Search/SearchRunner.php
+++ b/app/Search/SearchRunner.php
@@ -50,7 +50,7 @@ class SearchRunner
      * The provided count is for each entity to search,
      * Total returned could be larger and not guaranteed.
      *
-     * @return array{total: int, count: int, has_more: bool, results: Entity[]}
+     * @return array{total: int, count: int, has_more: bool, results: Collection<Entity>}
      */
     public function searchEntities(SearchOptions $searchOpts, string $entityType = 'all', int $page = 1, int $count = 20): array
     {