fix: cannot define a join field when the target relationship is nested to a second or higher tab (#12041)

Fixes https://github.com/payloadcms/payload/issues/11720

test/joins/collections/Categories.ts

@@ -162,6 +162,12 @@ export const Categories: CollectionConfig = {
         isFiltered: { not_equals: true },
       },
     },
+    {
+      name: 'inTab',
+      type: 'join',
+      collection: postsSlug,
+      on: 'tab.category',
+    },
     {
       name: 'joinWithError',
       type: 'join',

test/joins/collections/Posts.ts

@@ -142,5 +142,34 @@ export const Posts: CollectionConfig = {
         },
       ],
     },
+    {
+      type: 'tabs',
+      tabs: [
+        {
+          name: 'first',
+          fields: [
+            {
+              type: 'text',
+              name: 'tabText',
+            },
+          ],
+        },
+        {
+          name: 'tab',
+          fields: [
+            {
+              type: 'row',
+              fields: [
+                {
+                  name: 'category',
+                  type: 'relationship',
+                  relationTo: categoriesSlug,
+                },
+              ],
+            },
+          ],
+        },
+      ],
+    },
   ],
 }

test/joins/payload-types.ts

@@ -113,6 +113,7 @@ export interface Config {
       localizedPolymorphic: 'posts';
       localizedPolymorphics: 'posts';
       filtered: 'posts';
+      inTab: 'posts';
       joinWithError: 'posts';
       hiddenPosts: 'hidden-posts';
       singulars: 'singular';
@@ -316,6 +317,12 @@ export interface Post {
         blockType: 'block';
       }[]
     | null;
+  first?: {
+    tabText?: string | null;
+  };
+  tab?: {
+    category?: (string | null) | Category;
+  };
   updatedAt: string;
   createdAt: string;
 }
@@ -429,6 +436,11 @@ export interface Category {
     hasNextPage?: boolean;
     totalDocs?: number;
   };
+  inTab?: {
+    docs?: (string | Post)[];
+    hasNextPage?: boolean;
+    totalDocs?: number;
+  };
   joinWithError?: {
     docs?: (string | Post)[];
     hasNextPage?: boolean;
@@ -935,6 +947,16 @@ export interface PostsSelect<T extends boolean = true> {
               blockName?: T;
             };
       };
+  first?:
+    | T
+    | {
+        tabText?: T;
+      };
+  tab?:
+    | T
+    | {
+        category?: T;
+      };
   updatedAt?: T;
   createdAt?: T;
 }
@@ -963,6 +985,7 @@ export interface CategoriesSelect<T extends boolean = true> {
   localizedPolymorphics?: T;
   singulars?: T;
   filtered?: T;
+  inTab?: T;
   joinWithError?: T;
   enableErrorOnJoin?: T;
   updatedAt?: T;